diff --git a/audio/guitarix/guitarix.SlackBuild b/audio/guitarix/guitarix.SlackBuild
index 99fe6f17f1..8a98bbd204 100644
--- a/audio/guitarix/guitarix.SlackBuild
+++ b/audio/guitarix/guitarix.SlackBuild
@@ -44,11 +44,12 @@ TMP=${TMP:-/tmp/SBo}
 PKG=$TMP/package-$PRGNAM
 OUTPUT=${OUTPUT:-/tmp}
 
+# 20220322 bkw: 32-bit builds need -mfxsr now.
 if [ "$ARCH" = "i586" ]; then
-  SLKCFLAGS="-O2 -march=i586 -mtune=i686 -msse"
+  SLKCFLAGS="-O2 -march=i586 -mtune=i686 -msse -mfxsr"
   LIBDIRSUFFIX=""
 elif [ "$ARCH" = "i686" ]; then
-  SLKCFLAGS="-O2 -march=i686 -mtune=i686 -msse"
+  SLKCFLAGS="-O2 -march=i686 -mtune=i686 -msse -mfxsr"
   LIBDIRSUFFIX=""
 elif [ "$ARCH" = "x86_64" ]; then
   SLKCFLAGS="-O2 -fPIC"