the batch file for windows is based off your system --proposed fix

[JeffChilders]

the following wont fix everyone but it is a bit more idiot proof for windows. I cant remember C much... its been 30 years after all but the batch file builds still suck but this should help. The only thing better would be creating a full installer imo

@echo off
cls

del dark.exe
del *.pdb

REM GO FROM HIGHEST TO LOWET TO GET THE CL VARS IE RUN THE LASTEST VCVARSALL.BAT
if exist "%PROGRAMFILES(X86)%\Microsoft Visual Studio\2018\Community\VC\Auxiliary\Build\vcvarsall.bat" (
echo "FOUND: Microsoft Visual Studio 2018"
call "%PROGRAMFILES(X86)%\Microsoft Visual Studio\2018\Community\VC\Auxiliary\Build\vcvarsall.bat" x86
goto FINAL
)
if exist "%PROGRAMFILES(X86)%\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" (
echo "FOUND: Microsoft Visual Studio 2017"
call "%PROGRAMFILES(X86)%\Microsoft Visual Studio\2017\Community\VC\Auxiliary\Build\vcvarsall.bat" x86
goto FINAL
)
if exist "%PROGRAMFILES(X86)%\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" (
echo "FOUND: Microsoft Visual Studio 14.0"
call "%PROGRAMFILES(X86)%\Microsoft Visual Studio 14.0\VC\vcvarsall.bat" x86
goto FINAL
)
if exist "%PROGRAMFILES(X86)%\Microsoft Visual Studio 13.0\VC\vcvarsall.bat" (
echo "FOUND: Microsoft Visual Studio 13.0"
call "%PROGRAMFILES(X86)%\Microsoft Visual Studio 13.0\VC\vcvarsall.bat" x86
goto FINAL
)
if exist "%PROGRAMFILES(X86)%\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" (
echo "FOUND: Microsoft Visual Studio 12.0"
call "%PROGRAMFILES(X86)%\Microsoft Visual Studio 12.0\VC\vcvarsall.bat" x86
goto FINAL
)

:FINAL

REM the the current working directory
SET CurrentDir=%cd%

SET INCLUDE_DIRS=/I"%CurrentDir%\sdl2\include"
SET OPTS=/c
SET DEBUG=/DDEBUG /Zi /Fddark.pdb

SET LIB_DIRS=/LIBPATH:"%CurrentDir%\sdl2\lib\x86"
SET LIBS=SDL2.lib SDL2main.lib
SET LINKER_OPTS=/SUBSYSTEM:console /DEBUG

cl %INCLUDE_DIRS% %OPTS% %DEBUG% dark.c

link %LIB_DIRS% %LINKER_OPTS% dark.obj %LIBS%

del *.obj