cmake HAVE_GETENV examples

HumbleNet/HumbleNet 3rdparty/libwebsockets/CMakeLists.txt :209 

CHECK_FUNCTION_EXISTS(getenv HAVE_GETENV)

MiKTeX/miktex CMakeLists.txt :1310 

check_function_exists(getenv HAVE_GETENV)

fluent/fluent-bit lib/c-ares-1.34.4/CMakeLists.txt :420 

CHECK_SYMBOL_EXISTS (getenv          "${CMAKE_EXTRA_INCLUDE_FILES}" HAVE_GETENV)

JulNadeauCA/libagar CMakeChecks.cmake :1386 

check_c_source_compiles("
#include <stdlib.h>

int
main(int argc, char *argv[])
{
	(void)getenv(\"PATH\");
	return (0);
}
" HAVE_GETENV)

infiniflow/infinity third_party/ijma/src/libmecab/ConfigureChecks.cmake :15 

CHECK_FUNCTION_EXISTS (getenv HAVE_GETENV)