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--- a/configure.in
+++ b/configure.in
@@ -49,10 +49,8 @@
 dnl
 dnl check gcc
 dnl
-if test -n "$GCC"; then
-   CFLAGS="-O3 -Wall";
-   CXXFLAGS="-O3 -Wall";
-fi
+CFLAGS="${CFLAGS} -Wall"
+CXXFLAGS="${CXXFLAGS} -Wall"
 
 AC_DEFUN(ADD_CC_FLAG, [
   AC_MSG_CHECKING(whether ${CC-cc} accepts $1)
@@ -285,6 +283,6 @@
 AC_MSG_RESULT([yes])
 
 AC_SUBST(datarootdir)
-AM_CONFIG_HEADER(config.h)
+AC_CONFIG_HEADERS(config.h)
 AC_OUTPUT([Makefile Makefile.msvc swig/version.h])