diff --git a/source/third_party/glad/README.md b/source/third_party/glad/README.md
index 60688fd604..db871358d0 100644
--- a/source/third_party/glad/README.md
+++ b/source/third_party/glad/README.md
@@ -4,6 +4,10 @@ This folder contains the files generated by the glad GL loader for the game.
 
 ## Instructions
 
+Install glad via package manager or pip, for the latter create a venv if
+necessary. Alternatively fetch the glad git repo as outlined below. On
+Windows fetching the git repo is assumed.
+
 Download glad v2:
 ```sh
 git clone https://github.com/Dav1dde/glad.git -b glad2
diff --git a/source/third_party/glad/update-headers.sh b/source/third_party/glad/update-headers.sh
index e06c9d7d82..26e5ed96a6 100755
--- a/source/third_party/glad/update-headers.sh
+++ b/source/third_party/glad/update-headers.sh
@@ -1,14 +1,21 @@
 #!/bin/sh
-(
-	cd glad || exit
-	python -m glad --api="gl:core=2.1" --extensions="../extensions/gl.txt" --out-path="../" c
-	python -m glad --api="gles2=2.0" --extensions="../extensions/gles2.txt" --out-path="../" c
-	python -m glad --api="glx=1.4" --extensions="../extensions/glx.txt" --out-path="../" c
-	python -m glad --api="wgl=1.0" --extensions="../extensions/wgl.txt" --out-path="../" c
-	python -m glad --api="egl=1.5" --extensions="../extensions/egl.txt" --out-path="../" c
-	python -m glad --api="vulkan=1.1" --extensions="../extensions/vulkan.txt" --out-path="../" c
-)
+set -e
+
+cd "$(dirname "$0")"
+
+# In case glad is not installed system wide or not installed via pip assume glad
+# repository was fetched into glad subdirectory.
+export PYTHONPATH="glad"
+
+python -m glad --api="gl:core=2.1" --extensions="extensions/gl.txt" --out-path="." c
+python -m glad --api="gles2=2.0" --extensions="extensions/gles2.txt" --out-path="." c
+python -m glad --api="glx=1.4" --extensions="extensions/glx.txt" --out-path="." c
+python -m glad --api="wgl=1.0" --extensions="extensions/wgl.txt" --out-path="." c
+python -m glad --api="egl=1.5" --extensions="extensions/egl.txt" --out-path="." c
+python -m glad --api="vulkan=1.1" --extensions="extensions/vulkan.txt" --out-path="." c
+
 patch -p1 --ignore-whitespace --fuzz 1 <fix_macos.patch
+
 mv src/gl.c src/gl.cpp
 mv src/gles2.c src/gles2.cpp
 mv src/glx.c src/glx.cpp