--- a/configure.ac	2026-10-30 13:25:57.909565568 +0100
+++ b/configure.ac	2026-10-30 13:26:27.570177870 +0100
@@ -526,7 +526,7 @@
 AC_C_CONST
 AC_TYPE_SIZE_T
 
-CC="$CC" CFLAGS="$CXXFLAGS" CPPFLAGS="$CPPFLAGS" \
+CC="$CC" CFLAGS="$CFLAGS" CXXFLAGS="$CXXFLAGS" CPPFLAGS="$CPPFLAGS" \
 LD="$LD" LDFLAGS="$LDFLAGS" LIBS="-lm $LIBS $FLIBS" \
 LN_S="$LN_S" NM="$NM" RANLIB="$RANLIB" \