New comment by tornaria on void-packages repository

https://github.com/void-linux/void-packages/issues/19090#issuecomment-911775458

Comment:
> @tornaria Same here on musl.
> 

Can you try again with the following patch?

```diff
diff --git a/build/pkgs/pyzmq/spkg-install.in b/build/pkgs/pyzmq/spkg-install.in
index 0ce404ee5a..b7260c6d27 100644
--- a/build/pkgs/pyzmq/spkg-install.in
+++ b/build/pkgs/pyzmq/spkg-install.in
@@ -1,6 +1,9 @@
 # Since we use environment vars we have to generate setup.cfg
 
-echo "[build_ext]" > src/setup.cfg
+echo "[global]" > src/setup.cfg
+echo "skip_check_zmq = True" >> src/setup.cfg
+
+echo "[build_ext]" >> src/setup.cfg
 
 # (I tried putting quotes around $SAGE_LOCAL to allow for spaces in
 # the path---which is never used but is a good habit to support---but
```
With this for me sage-9.4 compiles and tests ok on musl, except for the following doctest failures:
```
sage -t --random-seed=0 src/sage/geometry/polyhedron/base.py  # 1 doctest failed
sage -t --random-seed=0 src/sage/lfunctions/sympow.py  # 3 doctests failed
sage -t --random-seed=0 src/sage/symbolic/expression.pyx  # 1 doctest failed
```