On Sun, Apr 2, 2023, at 4:17 PM, alexandre schenberg wrote: > I have the following piece of code belonging to a larger zlib detection code. It looks to me like you've quoted the *generated* autoconf code. Can you please show us the source code? Note that the problem may be very far away from where you think it is; it would be best if you could either produce a "minimized test case" (the shortest possible, self-contained, configure.ac that still demonstrates the problem) or link us to your complete project. zw