diff --git a/dev-libs/isl/isl-0.21.ebuild b/dev-libs/isl/isl-0.21.ebuild
index 593ac2f4e212a..b3e801e7fc300 100644
--- a/dev-libs/isl/isl-0.21.ebuild
+++ b/dev-libs/isl/isl-0.21.ebuild
@@ -21,15 +21,9 @@ DEPEND="${RDEPEND}
 
 DOCS=( ChangeLog AUTHORS doc/manual.pdf )
 
-src_prepare() {
-	eapply "${FILESDIR}"/${PN}-0.19-gdb-autoload-dir.patch
-
-	# m4/ax_create_pkgconfig_info.m4 is broken but avoid eautoreconf
-	# https://groups.google.com/group/isl-development/t/37ad876557e50f2c
-	sed -i -e '/Libs:/s:@LDFLAGS@ ::' configure || die #382737
-
-	eapply_user
-}
+PATCHES=(
+	"${FILESDIR}"/${PN}-0.19-gdb-autoload-dir.patch
+)
 
 multilib_src_configure() {
 	ECONF_SOURCE="${S}" econf $(use_enable static-libs static)