-CXXFLAGS=-Wall @CXXFLAGS@ -I$(GTEST_DIR)/include @Eigen3_CFLAGS@ @GLEW_CFLAGS@
-LDFLAGS=@GLEW_LIBS@ @SDL_LIBS@ -lpthread
-DEMO_LDLIBS=@SDL_image_LIBS@ -lrt -lpthread @libpng_LIBS@
-LIBTOOL=@LIBTOOL@
+CXXFLAGS=-Wall @CXXFLAGS@ -I$(GTEST_DIR)/include @Eigen3_CFLAGS@ @GLEW_CFLAGS@ @FFTW3_CFLAGS@
+LDFLAGS=@GLEW_LIBS@ @SDL_LIBS@ @FFTW3_LIBS@ -lpthread
+DEMO_LDLIBS=@SDL_image_LIBS@ -lrt -lpthread @libpng_LIBS@ @FFTW3_LIBS@
+SHELL=@SHELL@
+LIBTOOL=@LIBTOOL@ --tag=CXX