diff --git a/src/ballistics.cpp b/src/ballistics.cpp
index 5ce0d30d90014..497da61481779 100644
--- a/src/ballistics.cpp
+++ b/src/ballistics.cpp
@@ -244,14 +244,14 @@ dealt_projectile_attack projectile_attack( const projectile &proj_arg, const tri
         rad += ( one_in( 2 ) ? 1 : -1 ) * std::min( ARCMIN( aim.dispersion ), DEGREES( 30 ) );
 
         // TODO: This should also represent the miss on z axis
-        const int offset = std::min<int>( range, sqrtf( aim.missed_by_tiles ) );
+        const int offset = std::min<int>( range, std::sqrtf( aim.missed_by_tiles ) );
         int new_range = no_overshoot ?
                         range + rng( -offset, offset ) :
                         rng( range - offset, proj_arg.range );
         new_range = std::max( new_range, 1 );
 
-        target.x = source.x + roll_remainder( new_range * cos( rad ) );
-        target.y = source.y + roll_remainder( new_range * sin( rad ) );
+        target.x = source.x + roll_remainder( new_range * std::cos( rad ) );
+        target.y = source.y + roll_remainder( new_range * std::sin( rad ) );
 
         if( target == source ) {
             target.x = source.x + sgn( dx );
diff --git a/src/bionics.cpp b/src/bionics.cpp
index ef58a6505b2e5..6f1b590061ff1 100644
--- a/src/bionics.cpp
+++ b/src/bionics.cpp
@@ -449,7 +449,7 @@ bool Character::activate_bionic( int b, bool eff_only )
         int humidity = get_local_humidity( weatherPoint.humidity, g->weather.weather,
                                            g->is_sheltered( g->u.pos() ) );
         // thirst units = 5 mL
-        int water_available = lround( humidity * 3.0 / 100.0 );
+        int water_available = std::lround( humidity * 3.0 / 100.0 );
         if( water_available == 0 ) {
             bio.powered = false;
             add_msg_if_player( m_bad, _( "There is not enough humidity in the air for your %s to function." ),
@@ -1520,7 +1520,7 @@ void Character::process_bionic( int b )
             int humidity = get_local_humidity( weatherPoint.humidity, g->weather.weather,
                                                g->is_sheltered( g->u.pos() ) );
             // in thirst units = 5 mL water
-            int water_available = lround( humidity * 3.0 / 100.0 );
+            int water_available = std::lround( humidity * 3.0 / 100.0 );
             // At 50% relative humidity or more, the player will draw 10 mL
             // At 16% relative humidity or less, the bionic will give up
             if( water_available == 0 ) {
diff --git a/src/consumption.cpp b/src/consumption.cpp
index 70ce57930213c..6d8778a2c2d7c 100644
--- a/src/consumption.cpp
+++ b/src/consumption.cpp
@@ -957,7 +957,7 @@ bool player::eat( item &food, bool force )
     }
 
     if( has_active_bionic( bio_taste_blocker ) ) {
-        mod_power_level( units::from_kilojoule( -abs( food.get_comestible_fun() ) ) );
+        mod_power_level( units::from_kilojoule( -std::abs( food.get_comestible_fun() ) ) );
     }
 
     if( food.has_flag( flag_FUNGAL_VECTOR ) && !has_trait( trait_M_IMMUNE ) ) {
diff --git a/src/debug.cpp b/src/debug.cpp
index ab55431f7571c..d0e9f05f7b083 100644
--- a/src/debug.cpp
+++ b/src/debug.cpp
@@ -290,7 +290,7 @@ static time_info get_time() noexcept
     const auto current = localtime( &tt );
 
     return time_info { current->tm_hour, current->tm_min, current->tm_sec,
-                       static_cast<int>( lround( tv.tv_usec / 1000.0 ) )
+                       static_cast<int>( std::lround( tv.tv_usec / 1000.0 ) )
                      };
 }
 #endif
diff --git a/src/explosion.cpp b/src/explosion.cpp
index ffe2af1e9263e..b88fc274303fc 100644
--- a/src/explosion.cpp
+++ b/src/explosion.cpp
@@ -136,7 +136,7 @@ static float mass_to_area( const float mass )
     // Density of steel in g/cm^3
     constexpr float steel_density = 7.85;
     float fragment_volume = ( mass / 1000.0 ) / steel_density;
-    float fragment_radius = cbrt( ( fragment_volume * 3.0 ) / ( 4.0 * M_PI ) );
+    float fragment_radius = std::cbrt( ( fragment_volume * 3.0 ) / ( 4.0 * M_PI ) );
     return fragment_radius * fragment_radius * M_PI;
 }
 
diff --git a/src/game.cpp b/src/game.cpp
index e513452de96ca..ff1e4cb7aa47c 100644
--- a/src/game.cpp
+++ b/src/game.cpp
@@ -3596,7 +3596,7 @@ void game::draw_minimap()
         double slope = ( cursx != targ.x ) ? static_cast<double>( targ.y - cursy ) / static_cast<double>
                        ( targ.x - cursx ) : 4;
 
-        if( cursx == targ.x || fabs( slope ) > 3.5 ) { // Vertical slope
+        if( cursx == targ.x || std::fabs( slope ) > 3.5 ) { // Vertical slope
             if( targ.y > cursy ) {
                 mvwputch( w_minimap, point( 3, 6 ), c_red, "*" );
             } else {
@@ -3605,7 +3605,7 @@ void game::draw_minimap()
         } else {
             int arrowx = -1;
             int arrowy = -1;
-            if( fabs( slope ) >= 1. ) { // y diff is bigger!
+            if( std::fabs( slope ) >= 1. ) { // y diff is bigger!
                 arrowy = ( targ.y > cursy ? 6 : 0 );
                 arrowx = static_cast<int>( 3 + 3 * ( targ.y > cursy ? slope : ( 0 - slope ) ) );
                 if( arrowx < 0 ) {
@@ -11100,7 +11100,7 @@ void game::perhaps_add_random_npc()
     const int npc_num = overmap_buffer.get_npcs_near_player( density_search_radius ).size();
     if( npc_num > 0 ) {
         // 100%, 80%, 64%, 52%, 41%, 33%...
-        density *= powf( 0.8f, npc_num );
+        density *= std::powf( 0.8f, npc_num );
     }
 
     if( !x_in_y( density, 100 ) ) {
diff --git a/src/item.cpp b/src/item.cpp
index 65639e8495d4f..8d04ff2bcf584 100644
--- a/src/item.cpp
+++ b/src/item.cpp
@@ -1638,8 +1638,8 @@ void item::food_info( const item *food_item, std::vector<iteminfo> &info,
         const double multiplier = g->u.vitamin_rate( v.first ) / 1_days * 100;
         const int min_value = min_nutr.get_vitamin( v.first );
         const int max_value = v.second;
-        const int min_rda = lround( min_value * multiplier );
-        const int max_rda = lround( max_value * multiplier );
+        const int min_rda = std::lround( min_value * multiplier );
+        const int max_rda = std::lround( max_value * multiplier );
         const std::string format = min_rda == max_rda ? "%s (%i%%)" : "%s (%i-%i%%)";
         return string_format( format, v.first->name(), min_value, max_value );
     };
@@ -5170,7 +5170,7 @@ static int calc_hourly_rotpoints_at_temp( const int temp )
     } else if( temp < dropoff ) {
         return ( temp - temperatures::freezing ) * dstep;
     } else {
-        return lround( 215.46 * std::pow( 2.0, static_cast<float>( temp ) / 16.0 ) );
+        return std::lround( 215.46 * std::pow( 2.0, static_cast<float>( temp ) / 16.0 ) );
     }
 }
 
@@ -5271,7 +5271,7 @@ units::volume item::get_storage() const
     }
     units::volume storage = t->storage;
     float mod = get_clothing_mod_val( clothing_mod_type_storage );
-    storage += lround( mod ) * units::legacy_volume_factor;
+    storage += std::lround( mod ) * units::legacy_volume_factor;
 
     return storage;
 }
@@ -5590,7 +5590,7 @@ int item::bash_resist( bool to_self ) const
         resist /= mat_types.size();
     }
 
-    return lround( ( resist * eff_thickness ) + mod );
+    return std::lround( ( resist * eff_thickness ) + mod );
 }
 
 int item::cut_resist( bool to_self ) const
@@ -5619,7 +5619,7 @@ int item::cut_resist( bool to_self ) const
         resist /= mat_types.size();
     }
 
-    return lround( ( resist * eff_thickness ) + mod );
+    return std::lround( ( resist * eff_thickness ) + mod );
 }
 
 #if defined(_MSC_VER)
@@ -5663,7 +5663,7 @@ int item::acid_resist( bool to_self, int base_env_resist ) const
         resist *= env / 10.0f;
     }
 
-    return lround( resist + mod );
+    return std::lround( resist + mod );
 }
 
 int item::fire_resist( bool to_self, int base_env_resist ) const
@@ -5694,7 +5694,7 @@ int item::fire_resist( bool to_self, int base_env_resist ) const
         resist *= env / 10.0f;
     }
 
-    return lround( resist + mod );
+    return std::lround( resist + mod );
 }
 
 int item::chip_resistance( bool worst ) const
@@ -8128,8 +8128,8 @@ void item::set_item_specific_energy( const float new_specific_energy )
     } else if( new_item_temperature < temp_to_kelvin( temperatures::cold ) ) {
         item_tags.insert( "COLD" );
     }
-    temperature = lround( 100000 * new_item_temperature );
-    specific_energy = lround( 100000 * new_specific_energy );
+    temperature = std::lround( 100000 * new_item_temperature );
+    specific_energy = std::lround( 100000 * new_specific_energy );
     reset_temp_check();
 }
 
@@ -8163,8 +8163,8 @@ void item::set_item_temperature( float new_temperature )
     float new_specific_energy = get_specific_energy_from_temperature( new_temperature );
     float freeze_percentage = 0;
 
-    temperature = lround( 100000 * new_temperature );
-    specific_energy = lround( 100000 * new_specific_energy );
+    temperature = std::lround( 100000 * new_temperature );
+    specific_energy = std::lround( 100000 * new_specific_energy );
 
     const float completely_frozen_specific_energy = specific_heat_solid *
             freezing_temperature;  // Energy that the item would have if it was completely solid at freezing temperature
@@ -8933,8 +8933,8 @@ void item::calc_temp( const int temp, const float insulation, const time_point &
     } else if( new_item_temperature < temp_to_kelvin( temperatures::cold ) ) {
         item_tags.insert( "COLD" );
     }
-    temperature = lround( 100000 * new_item_temperature );
-    specific_energy = lround( 100000 * new_specific_energy );
+    temperature = std::lround( 100000 * new_item_temperature );
+    specific_energy = std::lround( 100000 * new_specific_energy );
 
     last_temp_check = time;
 }
@@ -8954,7 +8954,7 @@ void item::heat_up()
     // Set item temperature to 60 C (333.15 K, 122 F)
     // Also set the energy to match
     temperature = 333.15 * 100000;
-    specific_energy = lround( 100000 * get_specific_energy_from_temperature( 333.15 ) );
+    specific_energy = std::lround( 100000 * get_specific_energy_from_temperature( 333.15 ) );
 
     reset_temp_check();
 }
@@ -8968,7 +8968,7 @@ void item::cold_up()
     // Set item temperature to 3 C (276.15 K, 37.4 F)
     // Also set the energy to match
     temperature = 276.15 * 100000;
-    specific_energy = lround( 100000 * get_specific_energy_from_temperature( 276.15 ) );
+    specific_energy = std::lround( 100000 * get_specific_energy_from_temperature( 276.15 ) );
 
     reset_temp_check();
 }
diff --git a/src/lightmap.cpp b/src/lightmap.cpp
index ff0217154601f..23e1f63639dbf 100644
--- a/src/lightmap.cpp
+++ b/src/lightmap.cpp
@@ -1421,15 +1421,15 @@ void map::apply_light_arc( const tripoint &p, int angle, float luminance, int wi
         if( trigdist ) {
             double fdist = ( ao * M_PI_2 ) / wangle;
             double orad = ( M_PI * ao / 180.0 );
-            end.x = static_cast<int>( p.x + ( static_cast<double>( range ) - fdist * 2.0 ) * cos(
+            end.x = static_cast<int>( p.x + ( static_cast<double>( range ) - fdist * 2.0 ) * std::cos(
                                           rad + orad ) );
-            end.y = static_cast<int>( p.y + ( static_cast<double>( range ) - fdist * 2.0 ) * sin(
+            end.y = static_cast<int>( p.y + ( static_cast<double>( range ) - fdist * 2.0 ) * std::sin(
                                           rad + orad ) );
             apply_light_ray( lit, p, end, luminance );
 
-            end.x = static_cast<int>( p.x + ( static_cast<double>( range ) - fdist * 2.0 ) * cos(
+            end.x = static_cast<int>( p.x + ( static_cast<double>( range ) - fdist * 2.0 ) * std::cos(
                                           rad - orad ) );
-            end.y = static_cast<int>( p.y + ( static_cast<double>( range ) - fdist * 2.0 ) * sin(
+            end.y = static_cast<int>( p.y + ( static_cast<double>( range ) - fdist * 2.0 ) * std::sin(
                                           rad - orad ) );
             apply_light_ray( lit, p, end, luminance );
         } else {
diff --git a/src/lightmap.h b/src/lightmap.h
index 8df48f6273a52..6a16e3ee6379d 100644
--- a/src/lightmap.h
+++ b/src/lightmap.h
@@ -23,7 +23,7 @@
 #define LIGHT_TRANSPARENCY_OPEN_AIR 0.038376418216
 #define LIGHT_TRANSPARENCY_CLEAR 1
 
-#define LIGHT_RANGE(b) static_cast<int>( -log(LIGHT_AMBIENT_LOW / static_cast<float>(b)) * (1.0 / LIGHT_TRANSPARENCY_OPEN_AIR) )
+#define LIGHT_RANGE(b) static_cast<int>( -std::log(LIGHT_AMBIENT_LOW / static_cast<float>(b)) * (1.0 / LIGHT_TRANSPARENCY_OPEN_AIR) )
 
 enum lit_level {
     LL_DARK = 0,
diff --git a/src/line.cpp b/src/line.cpp
index 2cf190cd00ae3..6dc9c1ae15231 100644
--- a/src/line.cpp
+++ b/src/line.cpp
@@ -606,16 +606,16 @@ rl_vec3d rl_vec3d::normalized() const
 rl_vec2d rl_vec2d::rotated( float angle ) const
 {
     return rl_vec2d(
-               x * cos( angle ) - y * sin( angle ),
-               x * sin( angle ) + y * cos( angle )
+               x * std::cos( angle ) - y * std::sin( angle ),
+               x * std::sin( angle ) + y * std::cos( angle )
            );
 }
 
 rl_vec3d rl_vec3d::rotated( float angle ) const
 {
     return rl_vec3d(
-               x * cos( angle ) - y * sin( angle ),
-               x * sin( angle ) + y * cos( angle )
+               x * std::cos( angle ) - y * std::sin( angle ),
+               x * std::sin( angle ) + y * std::cos( angle )
            );
 }
 
@@ -754,8 +754,8 @@ void calc_ray_end( int angle, const int range, const tripoint &p, tripoint &out
     const double rad = DEGREES( angle );
     out.z = p.z;
     if( trigdist ) {
-        out.x = p.x + range * cos( rad );
-        out.y = p.y + range * sin( rad );
+        out.x = p.x + range * std::cos( rad );
+        out.y = p.y + range * std::sin( rad );
     } else {
         int mult = 0;
         if( angle >= 135 && angle <= 315 ) {
@@ -766,9 +766,9 @@ void calc_ray_end( int angle, const int range, const tripoint &p, tripoint &out
 
         if( angle <= 45 || ( 135 <= angle && angle <= 215 ) || 315 < angle ) {
             out.x = p.x + range * mult;
-            out.y = p.y + range * tan( rad ) * mult;
+            out.y = p.y + range * std::tan( rad ) * mult;
         } else {
-            out.x = p.x + range * 1 / tan( rad ) * mult;
+            out.x = p.x + range * 1 / std::tan( rad ) * mult;
             out.y = p.y + range * mult;
         }
     }
diff --git a/src/line.h b/src/line.h
index 724c0f7ade12e..e7134cd1b6982 100644
--- a/src/line.h
+++ b/src/line.h
@@ -32,7 +32,7 @@ constexpr double ARCMIN( double v )
 inline double iso_tangent( double distance, double vertex )
 {
     // we can use the cosine formula (a² = b² + c² - 2bc⋅cosθ) to calculate the tangent
-    return std::sqrt( 2 * std::pow( distance, 2 ) * ( 1 - cos( ARCMIN( vertex ) ) ) );
+    return std::sqrt( 2 * std::pow( distance, 2 ) * ( 1 - std::cos( ARCMIN( vertex ) ) ) );
 }
 
 //! This compile-time usable function combines the sign of each (x, y, z) component into a single integer
diff --git a/src/map.cpp b/src/map.cpp
index c31b7da76dee2..ce59663c1e4b9 100755
--- a/src/map.cpp
+++ b/src/map.cpp
@@ -553,7 +553,7 @@ vehicle *map::move_vehicle( vehicle &veh, const tripoint &dp, const tileray &fac
     int coll_turn = 0;
     if( impulse > 0 ) {
         coll_turn = shake_vehicle( veh, velocity_before, facing.dir() );
-        const int volume = std::min<int>( 100, sqrtf( impulse ) );
+        const int volume = std::min<int>( 100, std::sqrtf( impulse ) );
         // TODO: Center the sound at weighted (by impulse) average of collisions
         sounds::sound( veh.global_pos3(), volume, sounds::sound_t::combat, _( "crash!" ),
                        false, "smash_success", "hit_vehicle" );
diff --git a/src/melee.cpp b/src/melee.cpp
index 432e626fefe68..73d093d30d681 100644
--- a/src/melee.cpp
+++ b/src/melee.cpp
@@ -2216,7 +2216,7 @@ double player::melee_value( const item &weap ) const
 
     float reach = weap.reach_range( *this );
     if( reach > 1.0f ) {
-        my_value *= 1.0f + 0.5f * ( sqrtf( reach ) - 1.0f );
+        my_value *= 1.0f + 0.5f * ( std::sqrtf( reach ) - 1.0f );
     }
 
     add_msg( m_debug, "%s as melee: %.1f", weap.type->get_id(), my_value );
diff --git a/src/npc.cpp b/src/npc.cpp
index 1bd1410d4fc20..2bcde461531ee 100644
--- a/src/npc.cpp
+++ b/src/npc.cpp
@@ -1368,8 +1368,8 @@ float npc::vehicle_danger( int radius ) const
 
             int ax = wrapped_veh.v->global_pos3().x;
             int ay = wrapped_veh.v->global_pos3().y;
-            int bx = int( ax + cos( facing * M_PI / 180.0 ) * radius );
-            int by = int( ay + sin( facing * M_PI / 180.0 ) * radius );
+            int bx = int( ax + std::cos( facing * M_PI / 180.0 ) * radius );
+            int by = int( ay + std::sin( facing * M_PI / 180.0 ) * radius );
 
             // fake size
             /* This will almost certainly give the wrong size/location on customized
diff --git a/src/overmap_noise.cpp b/src/overmap_noise.cpp
index 10ff4d9405333..36443c60c5937 100644
--- a/src/overmap_noise.cpp
+++ b/src/overmap_noise.cpp
@@ -11,10 +11,10 @@ float om_noise_layer_forest::noise_at( const point &local_omt_pos ) const
 {
     const point p = global_omt_pos( local_omt_pos );
     float r = scaled_octave_noise_3d( 8, 0.5, 0.03, 0, 1, p.x, p.y, get_seed() );
-    r = powf( r, 2 );
+    r = std::powf( r, 2 );
 
     float d = scaled_octave_noise_3d( 12, 0.5, 0.07, 0, 1, p.x, p.y, get_seed() );
-    d = powf( d, 3 );
+    d = std::powf( d, 3 );
 
     return std::max( 0.0f, r - d * 0.5f );
 }
@@ -23,7 +23,7 @@ float om_noise_layer_floodplain::noise_at( const point &local_omt_pos ) const
 {
     const point p = global_omt_pos( local_omt_pos );
     float r = scaled_octave_noise_3d( 8, 0.5, 0.05, 0, 1, p.x, p.y, get_seed() );
-    r = powf( r, 2 );
+    r = std::powf( r, 2 );
     return r;
 }
 
@@ -31,7 +31,7 @@ float om_noise_layer_lake::noise_at( const point &local_omt_pos ) const
 {
     const point p = global_omt_pos( local_omt_pos );
     float r = scaled_octave_noise_3d( 16, 0.5, 0.002, 0, 1, p.x, p.y, get_seed() );
-    r = powf( r, 4 );
+    r = std::powf( r, 4 );
     return r;
 }
 
diff --git a/src/panels.cpp b/src/panels.cpp
index ec5af2894d0a4..69db8574e7899 100644
--- a/src/panels.cpp
+++ b/src/panels.cpp
@@ -349,7 +349,7 @@ void overmap_ui::draw_overmap_chunk( const catacurses::window &w_minimap, const
         double slope = ( cursx != targ.x ) ? static_cast<double>( targ.y - cursy ) / static_cast<double>
                        ( targ.x - cursx ) : 4;
 
-        if( cursx == targ.x || fabs( slope ) > 3.5 ) {  // Vertical slope
+        if( cursx == targ.x || std::fabs( slope ) > 3.5 ) {  // Vertical slope
             if( targ.y > cursy ) {
                 mvwputch( w_minimap, point( 3 + start_x, 6 + start_y ), c_red, '*' );
             } else {
@@ -358,7 +358,7 @@ void overmap_ui::draw_overmap_chunk( const catacurses::window &w_minimap, const
         } else {
             int arrowx = -1;
             int arrowy = -1;
-            if( fabs( slope ) >= 1. ) {  // y diff is bigger!
+            if( std::fabs( slope ) >= 1. ) {  // y diff is bigger!
                 arrowy = ( targ.y > cursy ? 6 : 0 );
                 arrowx = static_cast<int>( 3 + 3 * ( targ.y > cursy ? slope : ( 0 - slope ) ) );
                 if( arrowx < 0 ) {
@@ -850,9 +850,9 @@ static int get_int_digits( const int &digits )
 {
     int temp = std::abs( digits );
     if( digits > 0 ) {
-        return static_cast<int>( log10( static_cast<double>( temp ) ) ) + 1;
+        return static_cast<int>( std::log10( static_cast<double>( temp ) ) ) + 1;
     } else if( digits < 0 ) {
-        return static_cast<int>( log10( static_cast<double>( temp ) ) ) + 2;
+        return static_cast<int>( std::log10( static_cast<double>( temp ) ) ) + 2;
     }
     return 1;
 }
diff --git a/src/player_display.cpp b/src/player_display.cpp
index 057d3a411df5f..f5533d987ed75 100644
--- a/src/player_display.cpp
+++ b/src/player_display.cpp
@@ -300,7 +300,7 @@ static void draw_stats_tab( const catacurses::window &w_stats, const catacurses:
                             string_format( _( "Melee to-hit bonus: <color_white>%+.1lf</color>" ), you.get_melee_hit_base() ) );
         print_colored_text( w_info, point( 1, 4 ), col_temp, c_light_gray,
                             string_format( _( "Ranged penalty: <color_white>%+d</color>" ),
-                                           -abs( you.ranged_dex_mod() ) ) );
+                                           -std::abs( you.ranged_dex_mod() ) ) );
         print_colored_text( w_info, point( 1, 5 ), col_temp, c_light_gray,
                             string_format( _( "Throwing penalty per target's dodge: <color_white>%+d</color>" ),
                                            you.throw_dispersion_per_dodge( false ) ) );
diff --git a/src/ranged.cpp b/src/ranged.cpp
index a3ca204437490..9008e6cb2aadf 100644
--- a/src/ranged.cpp
+++ b/src/ranged.cpp
@@ -1468,9 +1468,9 @@ std::vector<tripoint> target_handler::target_ui( player &pc, target_mode mode,
         }
         static const double recoil_per_deg = MAX_RECOIL / 180;
 
-        const double phi = fmod( std::abs( coord_to_angle( pc.pos(), dst ) -
-                                           coord_to_angle( pc.pos(), recoil_pos ) ),
-                                 360.0 );
+        const double phi = std::fmod( std::abs( coord_to_angle( pc.pos(), dst ) -
+                                                coord_to_angle( pc.pos(), recoil_pos ) ),
+                                      360.0 );
         const double angle = phi > 180.0 ? 360.0 - phi : phi;
 
         return std::min( recoil_pc + angle * recoil_per_deg, MAX_RECOIL );
diff --git a/src/sdltiles.cpp b/src/sdltiles.cpp
index 34d467094207c..d9f46ab5f3aa5 100644
--- a/src/sdltiles.cpp
+++ b/src/sdltiles.cpp
@@ -3120,11 +3120,11 @@ static void CheckMessages()
                             if( is_default_mode ) {
                                 float x1 = ( finger_curr_x - finger_down_x );
                                 float y1 = ( finger_curr_y - finger_down_y );
-                                float d1 = ( float )( sqrtf( x1 * x1 + y1 * y1 ) );
+                                float d1 = ( float )( std::sqrtf( x1 * x1 + y1 * y1 ) );
 
                                 float x2 = ( second_finger_curr_x - second_finger_down_x );
                                 float y2 = ( second_finger_curr_y - second_finger_down_y );
-                                float d2 = ( float )( sqrtf( x2 * x2 + y2 * y2 ) );
+                                float d2 = ( float )( std::sqrtf( x2 * x2 + y2 * y2 ) );
 
                                 float longest_window_edge = std::max( WindowWidth, WindowHeight );
 
diff --git a/src/simplexnoise.cpp b/src/simplexnoise.cpp
index 117676c200451..ac677d860ba30 100644
--- a/src/simplexnoise.cpp
+++ b/src/simplexnoise.cpp
@@ -187,13 +187,13 @@ float raw_noise_2d( const float x, const float y )
     float n2 = 0;
 
     // Skew the input space to determine which simplex cell we're in
-    static const float F2 = 0.5f * ( sqrtf( 3.0f ) - 1.0f );
+    static const float F2 = 0.5f * ( std::sqrtf( 3.0f ) - 1.0f );
     // Hairy factor for 2D
     float s = ( x + y ) * F2;
     int i = fastfloor( x + s );
     int j = fastfloor( y + s );
 
-    static const float G2 = ( 3.0f - sqrtf( 3.0f ) ) / 6.0f;
+    static const float G2 = ( 3.0f - std::sqrtf( 3.0f ) ) / 6.0f;
     float t = ( i + j ) * G2;
     // Unskew the cell origin back to (x,y) space
     float X0 = i - t;
@@ -397,8 +397,8 @@ float raw_noise_3d( const float x, const float y, const float z )
 float raw_noise_4d( const float x, const float y, const float z, const float w )
 {
     // The skewing and unskewing factors are hairy again for the 4D case
-    static const float F4 = ( sqrtf( 5.0f ) - 1.0f ) / 4.0f;
-    static const float G4 = ( 5.0f - sqrtf( 5.0f ) ) / 20.0f;
+    static const float F4 = ( std::sqrtf( 5.0f ) - 1.0f ) / 4.0f;
+    static const float G4 = ( 5.0f - std::sqrtf( 5.0f ) ) / 20.0f;
     float n0, n1, n2, n3, n4; // Noise contributions from the five corners
 
     // Skew the (x,y,z,w) space to determine which cell of 24 simplices we're in
diff --git a/src/suffer.cpp b/src/suffer.cpp
index 1c37b2b760aeb..6bac54b0281d3 100644
--- a/src/suffer.cpp
+++ b/src/suffer.cpp
@@ -1809,7 +1809,7 @@ void Character::apply_wetness_morale( int temperature )
 
         if( bp_morale < 0 ) {
             // Damp, hot clothing on hot skin feels bad
-            scaled_temperature = fabs( scaled_temperature );
+            scaled_temperature = std::fabs( scaled_temperature );
         }
 
         // For an unmutated human swimming in deep water, this will add up to:
diff --git a/src/teleport.cpp b/src/teleport.cpp
index 86a1a6c61de30..251a79b9a21d0 100644
--- a/src/teleport.cpp
+++ b/src/teleport.cpp
@@ -44,8 +44,8 @@ bool teleport::teleport( Creature &critter, int min_distance, int max_distance,
     do {
         int rangle = rng( 0, 360 );
         int rdistance = rng( min_distance, max_distance );
-        new_pos.x = origin.x + rdistance * cos( rangle );
-        new_pos.y = origin.y + rdistance * sin( rangle );
+        new_pos.x = origin.x + rdistance * std::cos( rangle );
+        new_pos.y = origin.y + rdistance * std::sin( rangle );
         tries++;
     } while( g->m.impassable( new_pos ) && tries < 20 );
     //handles teleporting into solids.
diff --git a/src/tileray.cpp b/src/tileray.cpp
index c1248bc60132a..3d595eadb7096 100644
--- a/src/tileray.cpp
+++ b/src/tileray.cpp
@@ -47,7 +47,7 @@ void tileray::init( int adir )
     direction = ( adir < 0 ? 360 - ( ( -adir ) % 360 ) : adir % 360 );
     last_d = point_zero;
     float direction_radians = static_cast<float>( direction ) * M_PI / 180.0;
-    rl_vec2d delta_f( cos( direction_radians ), sin( direction_radians ) );
+    rl_vec2d delta_f( std::cos( direction_radians ), std::sin( direction_radians ) );
     delta = ( delta_f * 100 ).as_point();
     abs_d = abs( delta );
     steps = 0;
diff --git a/src/vehicle.cpp b/src/vehicle.cpp
index bdd6e7c2f474a..eda16b706838d 100644
--- a/src/vehicle.cpp
+++ b/src/vehicle.cpp
@@ -1224,7 +1224,7 @@ int vehicle::part_vpower_w( const int index, const bool at_full_hp ) const
             double raddir = ( ( g->weather.winddirection + 180 ) % 360 ) * ( M_PI / 180 );
             windvec = windvec.normalized();
             windvec.y = -cos( raddir );
-            windvec.x = sin( raddir );
+            windvec.x = std::sin( raddir );
             rl_vec2d fv = face_vec();
             double dot = windvec.dot_product( fv );
             if( dot <= 0 ) {
@@ -3798,7 +3798,7 @@ void vehicle::noise_and_smoke( int load, time_duration time )
     // Cap engine noise to avoid deafening.
     noise = std::min( noise, 100.0 );
     // Even a vehicle with engines off will make noise traveling at high speeds
-    noise = std::max( noise, static_cast<double>( fabs( velocity / 500.0 ) ) );
+    noise = std::max( noise, static_cast<double>( std::fabs( velocity / 500.0 ) ) );
     int lvl = 0;
     if( one_in( 4 ) && rng( 0, 30 ) < noise ) {
         while( noise > sounds[lvl].second ) {
diff --git a/src/vehicle_move.cpp b/src/vehicle_move.cpp
index 100a05dae0b32..42872e3558eff 100644
--- a/src/vehicle_move.cpp
+++ b/src/vehicle_move.cpp
@@ -91,7 +91,7 @@ int vehicle::slowdown( int at_velocity ) const
     } else if( !is_falling && !is_flying ) {
         double f_rolling_drag = coeff_rolling_drag() * ( vehicles::rolling_constant_to_variable + mps );
         // increase rolling resistance by up to 25x if the vehicle is skidding at right angle to facing
-        const double skid_factor = 1 + 24 * std::abs( sin( DEGREES( face.dir() - move.dir() ) ) );
+        const double skid_factor = 1 + 24 * std::abs( std::sin( DEGREES( face.dir() - move.dir() ) ) );
         f_total_drag += f_rolling_drag * skid_factor;
     }
     double accel_slowdown = f_total_drag / to_kilogram( total_mass() );
@@ -1215,7 +1215,7 @@ rl_vec2d vehicle::velo_vec() const
 
 inline rl_vec2d degree_to_vec( double degrees )
 {
-    return rl_vec2d( cos( degrees * M_PI / 180 ), sin( degrees * M_PI / 180 ) );
+    return rl_vec2d( std::cos( degrees * M_PI / 180 ), std::sin( degrees * M_PI / 180 ) );
 }
 
 // normalized.
@@ -1466,7 +1466,7 @@ vehicle *vehicle::act_on_map()
         const float old_vel = vmiph_to_mps( vertical_velocity );
         // Formula is v_2 = sqrt( 2*d*g + v_1^2 )
         // Note: That drops the sign
-        const float new_vel = -sqrt( 2 * tile_height * g + old_vel * old_vel );
+        const float new_vel = -std::sqrt( 2 * tile_height * g + old_vel * old_vel );
         vertical_velocity = mps_to_vmiph( new_vel );
         is_falling = true;
     } else {
diff --git a/src/weather_gen.cpp b/src/weather_gen.cpp
index 8233837038e2f..4f14b12c1beba 100644
--- a/src/weather_gen.cpp
+++ b/src/weather_gen.cpp
@@ -57,7 +57,7 @@ static weather_gen_common get_common_data( const tripoint &location, const time_
     const double year_fraction( time_past_new_year( t ) /
                                 calendar::year_length() ); // [0,1)
 
-    result.cyf = cos( tau * ( year_fraction + .125 ) ); // [-1, 1]
+    result.cyf = std::cos( tau * ( year_fraction + .125 ) ); // [-1, 1]
     // We add one-eighth to line up `cyf` so that 1 is at
     // midwinter and -1 at midsummer. (Cataclsym DDA years
     // start when spring starts. Gregorian years start when
@@ -79,7 +79,7 @@ static double weather_temperature_from_common_data( const weather_generator &wg,
     // -1 in midwinter, +1 in midsummer
     const season_type season = common.season;
     const double dayFraction = time_past_midnight( t ) / 1_days;
-    const double dayv = cos( tau * ( dayFraction + .5 - coldest_hour / 24 ) );
+    const double dayv = std::cos( tau * ( dayFraction + .5 - coldest_hour / 24 ) );
     // -1 at coldest_hour, +1 twelve hours later
 
     // manually specified seasonal temp variation from region_settings.json
@@ -273,10 +273,10 @@ int weather_generator::get_water_temperature() const
     }
 
     // Temperature varies between 33.8F and 75.2F depending on the time of year. Day = 0 corresponds to the start of spring.
-    int annual_mean_water_temperature = 54.5 + 20.7 * sin( tau * ( day - season_length * 0.5 ) /
+    int annual_mean_water_temperature = 54.5 + 20.7 * std::sin( tau * ( day - season_length * 0.5 ) /
                                         ( season_length * 4.0 ) );
     // Temperature varies between +2F and -2F depending on the time of day. Hour = 0 corresponds to midnight.
-    int daily_water_temperature_varaition = 2.0 + 2.0 * sin( tau * ( hour - 6.0 ) / 24.0 );
+    int daily_water_temperature_varaition = 2.0 + 2.0 * std::sin( tau * ( hour - 6.0 ) / 24.0 );
 
     water_temperature = annual_mean_water_temperature + daily_water_temperature_varaition;