nixpkgs/pkgs/development/libraries/boost/pthread-stack-min-fix.patch

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Taken from https://github.com/conan-io/conan-center-index/pull/361/files
diff --git a/include/boost/thread/pthread/thread_data.hpp b/include/boost/thread/pthread/thread_data.hpp
index aefbeb4..bc9b136 100644
--- a/boost/thread/pthread/thread_data.hpp
+++ b/boost/thread/pthread/thread_data.hpp
@@ -57,7 +57,7 @@ namespace boost
#else
std::size_t page_size = ::sysconf( _SC_PAGESIZE);
#endif
-#if PTHREAD_STACK_MIN > 0
+#ifdef PTHREAD_STACK_MIN
if (size<PTHREAD_STACK_MIN) size=PTHREAD_STACK_MIN;
#endif
size = ((size+page_size-1)/page_size)*page_size;