diff --git a/ext/f2c_math/Makefile.in b/ext/f2c_math/Makefile.in
index fcaea3f10..e10954a80 100644
--- a/ext/f2c_math/Makefile.in
+++ b/ext/f2c_math/Makefile.in
@@ -25,8 +25,7 @@ CC = @CC@
 # C++ compile flags
 PIC_FLAG=@PIC@
 CXX_FLAGS = @CXXFLAGS@ $(CXX_OPT) $(PIC_FLAG)
-
-CFLAGS = @CFLAGS@ $(CXX_OPT)
+CFLAGS = @CFLAGS@ $(CXX_OPT) $(PIC_FLAG)
 
 # Local include files
 CXX_INCLUDES=-I../f2c_libs