diff --git a/sys-devel/m4/m4-1.4.18.recipe b/sys-devel/m4/m4-1.4.18.recipe
index d7d209373..c9a74e80c 100644
--- a/sys-devel/m4/m4-1.4.18.recipe
+++ b/sys-devel/m4/m4-1.4.18.recipe
@@ -14,7 +14,7 @@ One of the biggest users of M4 is the GNU Autoconf project."
 HOMEPAGE="https://www.gnu.org/software/m4/"
 COPYRIGHT="2000, 2005-2016 Free Software Foundation, Inc."
 LICENSE="GNU GPL v3"
-REVISION="2"
+REVISION="3"
 SOURCE_URI="https://ftp.gnu.org/gnu/m4/m4-$portVersion.tar.gz"
 CHECKSUM_SHA256="ab2633921a5cd38e48797bf5521ad259bdc4b979078034a3b790d7fec5493fab"
 ARCHITECTURES="x86_gcc2 x86 x86_64 arm"
@@ -37,6 +37,7 @@ BUILD_PREREQUIRES="
 	cmd:ld
 	cmd:make
 	cmd:sed
+	cmd:help2man
 	"
 
 TEST_REQUIRES="