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Strip the _POSIX_C_SOURCE=200809L define again, our libc++ breaks claiming
that a set included from locale cannot find isascii()...
--- vendor/source/igraph/etc/cmake/compilers.cmake.orig 2025-06-11 00:03:00 UTC
+++ vendor/source/igraph/etc/cmake/compilers.cmake
@@ -1,13 +1,5 @@ include(CheckCCompilerFlag)
include(CheckCCompilerFlag)
-# Enable POSIX features. This needs to be set here instead of in source files so
-# that it affects CMake-based feature tests.
-#
-# See:
-# - https://pubs.opengroup.org/onlinepubs/007904875/functions/xsh_chap02_02.html
-# - https://www.gnu.org/software/libc/manual/html_node/Feature-Test-Macros.html
-add_compile_definitions(_POSIX_C_SOURCE=200809L)
-
if(MSVC)
add_compile_options(/FS)
add_compile_definitions(_CRT_SECURE_NO_WARNINGS) # necessary to compile for UWP
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