execinfo error when compiling with musl-libc (Alpine Linux)

[axelu]

Trying to build latest sources respectively master on Alpine (Alpine latest stable 3.11).

[ 29%] Building C object CMakeFiles/h2o-httpclient.dir/src/httpclient.c.o
/home/axel/h2o/src/httpclient.c:25:10: fatal error: execinfo.h: No such file or directory
   25 | #include <execinfo.h>
      |          ^~~~~~~~~~~~
compilation terminated.

Alpine with musl-libc does not provide such a header by default.
I found a similar issue described at awslabs/aws-c-common#322.

To get over the error for now, I added libexecinfo-dev package via apk on Alpine, but I am not sure that is the correct approach.