diff --git a/dev-libs/libtommath/libtommath-1.2.0-r1.ebuild b/dev-libs/libtommath/libtommath-1.2.0-r2.ebuild
similarity index 94%
rename from dev-libs/libtommath/libtommath-1.2.0-r1.ebuild
rename to dev-libs/libtommath/libtommath-1.2.0-r2.ebuild
index 7b117347f4e7d..02a55d1fc6fef 100644
--- a/dev-libs/libtommath/libtommath-1.2.0-r1.ebuild
+++ b/dev-libs/libtommath/libtommath-1.2.0-r2.ebuild
@@ -57,6 +57,9 @@ _emake() {
 }
 
 src_compile() {
+	# Replace hard-coded libdir=${exec_prefix}/lib.
+	sed -i -e "/libdir=/s:/lib:/$(get_libdir):" libtommath.pc.in || die
+
 	_emake -f makefile.shared
 }