diff --git a/ffmpeg-5.changes b/ffmpeg-5.changes
index 756630b..7a23134 100644
--- a/ffmpeg-5.changes
+++ b/ffmpeg-5.changes
@@ -1,3 +1,9 @@
+-------------------------------------------------------------------
+Sun Jan 30 20:07:03 UTC 2022 - Jan Engelhardt <jengelh@inai.de>
+
+- Enable building with glslang. (Should enable video blending
+  with GLSL.)
+
 -------------------------------------------------------------------
 Sun Jan 16 12:09:57 UTC 2022 - Callum Farmer <gmbr3@opensuse.org>
 
diff --git a/ffmpeg-5.spec b/ffmpeg-5.spec
index d8cc2fa..897b169 100644
--- a/ffmpeg-5.spec
+++ b/ffmpeg-5.spec
@@ -204,6 +204,8 @@ BuildRequires:  pkgconfig(vdpau)
 BuildRequires:  pkgconfig(vidstab) >= 0.98
 %endif
 %if %{with vulkan}
+BuildRequires:  glslang-devel
+BuildRequires:  pkgconfig(SPIRV-Tools)
 BuildRequires:  pkgconfig(vulkan)
 %endif
 BuildRequires:  pkgconfig(vorbis)
@@ -588,7 +590,7 @@ LDFLAGS="%_lto_cflags" \
 	--enable-gnutls \
 	--enable-ladspa \
 %if %{with vulkan}
-	--enable-vulkan \
+	--enable-libglslang --enable-vulkan \
 %endif
 %if ! %{with cuda_sdk}
 	--disable-cuda-sdk \