diff --git a/ext/f2c_lapack/Makefile.in b/ext/f2c_lapack/Makefile.in
index dbe7694c4..7764f1c7a 100755
--- a/ext/f2c_lapack/Makefile.in
+++ b/ext/f2c_lapack/Makefile.in
@@ -21,7 +21,7 @@ CXX = @CXX@
 CC = @CC@
 
 # C++ compile flags
-CXX_FLAGS = @CXXFLAGS@ $(CXX_OPT)
+CXX_FLAGS = @CXXFLAGS@ 
 
 # Local include files
 CXX_INCLUDES=-I../f2c_libs