diff --git a/R-proj/src/Makevars b/R-proj/src/Makevars
index b642e2fbe..ea3607acf 100644
--- a/R-proj/src/Makevars
+++ b/R-proj/src/Makevars
@@ -2,8 +2,6 @@ PKG_CPPFLAGS= -I../../external/boost -I../../external/LPsolve_src/run_headers -I
 
 PKG_CXXFLAGS= -Wno-deprecated-declarations -lm -ldl -Wno-ignored-attributes -DBOOST_NO_AUTO_PTR -DDISABLE_NLP_ORACLES
 
-CXX_STD = CXX11
-
 PKG_LIBS=-LRproj_externals/lp_solve -llp_solve -L../../external/PackedCSparse/qd -lqd $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
 
 $(SHLIB): Rproj_externals/lp_solve/liblp_solve.a ../../external/PackedCSparse/qd/libqd.a
diff --git a/R-proj/src/Makevars.win b/R-proj/src/Makevars.win
index 17d28e206..83ed4e0c6 100644
--- a/R-proj/src/Makevars.win
+++ b/R-proj/src/Makevars.win
@@ -1,6 +1,5 @@
 PKG_CPPFLAGS=-I../../external/boost -I../../external/LPsolve_src/run_headers -I../../external/minimum_ellipsoid -I../../include -I../../include/convex_bodies/spectrahedra
 PKG_CXXFLAGS= -Wno-deprecated-declarations -lm -ldl -Wno-ignored-attributes -DBOOST_NO_AUTO_PTR -DDISABLE_NLP_ORACLES
-CXX_STD = CXX11
 
 PKG_LIBS=-LRproj_externals/lp_solve -llp_solve -L../../external/PackedCSparse/qd -lqd $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
 
diff --git a/cran_gen/Makevars b/cran_gen/Makevars
index 28c42dcad..8194d4c8a 100644
--- a/cran_gen/Makevars
+++ b/cran_gen/Makevars
@@ -1,6 +1,5 @@
 PKG_CPPFLAGS=-Iexternal -Iexternal/lpsolve/headers/run_headers -Iexternal/minimum_ellipsoid -Iinclude -Iinclude/convex_bodies/spectrahedra
 PKG_CXXFLAGS= -DBOOST_NO_AUTO_PTR -DDISABLE_NLP_ORACLES
-CXX_STD = CXX11
 
 PKG_LIBS=-Lexternal/lpsolve/build/lp_solve -llp_solve -Lexternal/PackedCSparse/qd -lqd $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)
 
diff --git a/cran_gen/Makevars.win b/cran_gen/Makevars.win
index b93299131..e4f79d991 100644
--- a/cran_gen/Makevars.win
+++ b/cran_gen/Makevars.win
@@ -1,6 +1,5 @@
 PKG_CPPFLAGS=-Iexternal -Iexternal/lpsolve/headers/run_headers -Iexternal/minimum_ellipsoid -Iinclude -Iinclude/convex_bodies/spectrahedra
 PKG_CXXFLAGS= -lm -ldl -DBOOST_NO_AUTO_PTR -DDISABLE_NLP_ORACLES
-CXX_STD = CXX11
 
 PKG_LIBS=-Lexternal/lpsolve/build/lp_solve -llp_solve -Lexternal/PackedCSparse/qd -lqd $(LAPACK_LIBS) $(BLAS_LIBS) $(FLIBS)