guile: fix strtol_l usage.

srcpkgs/guile/template

@@ -1,7 +1,7 @@
 # Template build file for 'guile'.
 pkgname=guile
 version=2.0.11
-revision=3
+revision=4
 build_style=gnu-configure
 configure_args="--disable-static --disable-error-on-warning"
 hostmakedepends="pkg-config"
@@ -14,6 +14,11 @@ distfiles="${GNU_SITE}/${pkgname}/${pkgname}-${version}.tar.gz"
 checksum=e6786c934346fa2e38e46d8d81a622bb1c16d130153523f6129fcd79ef1fb040
 nocross=yes   # only works for same wordsize and endianess
 
+post_extract() {
+	case "$XBPS_TARGET_MACHINE" in
+		*-musl) sed -i '/strtol_l/{N;d}' libguile/i18n.c;;
+	esac
+}
 libguile_package() {
 	short_desc+=" - runtime library"
 	pkg_install() {