diff -Naur ogmtools-1.5-old/configure ogmtools-1.5/configure
--- ogmtools-1.5-old/configure	2004-11-07 12:02:42.000000000 +0200
+++ ogmtools-1.5/configure	2009-09-19 12:17:48.951498928 +0300
@@ -2260,7 +2260,7 @@
 GCC=`test $ac_compiler_gnu = yes && echo yes`
 ac_test_CFLAGS=${CFLAGS+set}
 ac_save_CFLAGS=$CFLAGS
-CFLAGS="-g"
+CFLAGS="$CFLAGS -g"
 echo "$as_me:$LINENO: checking whether $CC accepts -g" >&5
 echo $ECHO_N "checking whether $CC accepts -g... $ECHO_C" >&6
 if test "${ac_cv_prog_cc_g+set}" = set; then
@@ -2903,7 +2903,7 @@
 GXX=`test $ac_compiler_gnu = yes && echo yes`
 ac_test_CXXFLAGS=${CXXFLAGS+set}
 ac_save_CXXFLAGS=$CXXFLAGS
-CXXFLAGS="-g"
+CXXFLAGS="$CXXFLAGS -g"
 echo "$as_me:$LINENO: checking whether $CXX accepts -g" >&5
 echo $ECHO_N "checking whether $CXX accepts -g... $ECHO_C" >&6
 if test "${ac_cv_prog_cxx_g+set}" = set; then
@@ -4672,8 +4672,8 @@
 fi
 
 
-CFLAGS="-Wall -Wno-sign-compare @OGG_CFLAGS@ @VORBIS_CFLAGS@ @AVILIB_CFLAGS@ @DEBUG_CFLAGS@ @PROFILING_CFLAGS@"
-CXXFLAGS="-Wall -Wno-sign-compare @OGG_CFLAGS@ @VORBIS_CFLAGS@ @AVILIB_CFLAGS@ @DEBUG_CFLAGS@ @PROFILING_CFLAGS@"
+CFLAGS="$CFLAGS -Wall -Wno-sign-compare @OGG_CFLAGS@ @VORBIS_CFLAGS@ @AVILIB_CFLAGS@ @DEBUG_CFLAGS@ @PROFILING_CFLAGS@"
+CXXFLAGS="$CXXFLAGS -Wall -Wno-sign-compare @OGG_CFLAGS@ @VORBIS_CFLAGS@ @AVILIB_CFLAGS@ @DEBUG_CFLAGS@ @PROFILING_CFLAGS@"
 
                     ac_config_files="$ac_config_files Makefile avilib/Makefile"
 cat >confcache <<\_ACEOF