diff --git a/sys-devel/jam/jam-2.5_2018_11_21.recipe b/sys-devel/jam/jam-2.5_2021_10_29.recipe
similarity index 79%
rename from sys-devel/jam/jam-2.5_2018_11_21.recipe
rename to sys-devel/jam/jam-2.5_2021_10_29.recipe
index 1f91c005e..b67430f91 100644
--- a/sys-devel/jam/jam-2.5_2018_11_21.recipe
+++ b/sys-devel/jam/jam-2.5_2021_10_29.recipe
@@ -13,12 +13,12 @@ thus portable among distinct compilers.
 providing the same functionality, and much, much more."
 HOMEPAGE="http://www.perforce.com/jam/jam.html"
 COPYRIGHT="1993-2003 Christopher Seiwald
-	2005-2018 Haiku, Inc."
+	2005-2021 Haiku, Inc."
 LICENSE="Jam"
-REVISION="8"
-srcGitRev="c473a032a0c45e58642aa1b785d745cf8b72016b"
+REVISION="1"
+srcGitRev="19aaa7936296ae7f71cd47f0d899c6543b2629b6"
 SOURCE_URI="https://github.com/haiku/buildtools/archive/$srcGitRev.tar.gz"
-CHECKSUM_SHA256="ebfb7cd54aa77517ebb5cf21fb65077ea4b88891a3fc478ca35a813d1b172b4f"
+CHECKSUM_SHA256="7ea7512d07d51cd006cd427090421cc1602c5484590c49f2431369266a117217"
 SOURCE_FILENAME="$portVersionedName.tar.gz"
 SOURCE_DIR="buildtools-$srcGitRev/jam"
 
@@ -36,6 +36,7 @@ BUILD_REQUIRES="
 	haiku_devel
 	"
 BUILD_PREREQUIRES="
+	cmd:bison
 	cmd:gcc
 	cmd:ld
 	cmd:make
@@ -51,9 +52,9 @@ BUILD()
 
 INSTALL()
 {
-	mkdir -p "$binDir"
-	cp bin.haikux86/g/jam "$binDir"
+	mkdir -pv "$binDir"
+	install -v bin.haikux86/g/jam "$binDir"
 
-	mkdir -p "$docDir"
-	cp Jam.html Jambase.html Jamfile.html README* "$docDir"
+	mkdir -pv "$docDir"
+	cp -afv Jam.html Jambase.html Jamfile.html README* "$docDir"
 }