diff --git a/development/rtags/0017-Add-when-argument-to-define-obsolete-function-alias.patch.gz b/development/rtags/0017-Add-when-argument-to-define-obsolete-function-alias.patch.gz
new file mode 100644
index 0000000000..39805b3c34
Binary files /dev/null and b/development/rtags/0017-Add-when-argument-to-define-obsolete-function-alias.patch.gz differ
diff --git a/development/rtags/rtags.SlackBuild b/development/rtags/rtags.SlackBuild
index 646b8932f6..24ccd4171b 100644
--- a/development/rtags/rtags.SlackBuild
+++ b/development/rtags/rtags.SlackBuild
@@ -26,7 +26,7 @@ cd $(dirname $0) ; CWD=$(pwd)
 
 PRGNAM=rtags
 VERSION=${VERSION:-2.38}
-BUILD=${BUILD:-1}
+BUILD=${BUILD:-2}
 TAG=${TAG:-_SBo}
 PKGTYPE=${PKGTYPE:-tgz}
 
@@ -78,6 +78,9 @@ tar xvf $CWD/rct-$RCT_VERSION.tar.gz
 rmdir rct
 mv rct-$RCT_VERSION rct
 cd ..
+# fix build with latest emacs in patches/
+# thanks debian maintainers
+zcat $CWD/0017-Add-when-argument-to-define-obsolete-function-alias.patch.gz | patch -p1 || exit 1
 chown -R root:root .
 find -L . \
  \( -perm 777 -o -perm 775 -o -perm 750 -o -perm 711 -o -perm 555 \