--- gmorgan-0.70/configure.in
+++ gmorgan-0.70/configure.in
@@ -15,7 +15,7 @@
 AC_CHECK_FUNCS([bzero memset select strdup])
 AM_GNU_GETTEXT([external])
 LIBS="`fltk-config --use-images --ldflags` -lasound"
-CXXFLAGS=" `fltk-config --use-images --cxxflags`"
+CXXFLAGS="${CXXFLAGS} `fltk-config --use-images --cxxflags`"
 AC_CHECK_HEADERS([unistd.h])
 AC_CHECK_HEADER(alsa/asoundlib.h, true, AC_MSG_ERROR([Alsa is required]))
 AC_PATH_PROG(FLTK_CONFIG, fltk-config, no)