macOS

libraries/cmake/source/zlib/README.md

@@ -1,6 +1,24 @@
 # zlib library build notes
 
-Check that the generated `zconf.h` and the compilation enables the defines that we are hardcoding in the CMakeLists.txt.
+Check that the defines we are hardcoding in the CMakeLists.txt corresponds to the ones that are enabled during compilation.
+Also verify that if there are preprocessors `#if/#ifdef` checks in `zconf.h` that are modified to `#if 1`,
+the respective define checked is also present among the defines we are hardcoding.
+
+For instance if
+```
+#ifdef HAVE_UNISTD_H    /* may be set to #if 1 by ./configure */
+#  define Z_HAVE_UNISTD_H
+#endif
+```
+
+becomes
+```
+#if 1    /* was set to #if 1 by ./configure */
+#  define Z_HAVE_UNISTD_H
+#endif
+```
+
+Add `HAVE_UNISTD_H` in the hardcoded defines.
 
 ## Linux