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-rw-r--r--Utilities/cmexpat/CMakeLists.txt6
1 files changed, 6 insertions, 0 deletions
diff --git a/Utilities/cmexpat/CMakeLists.txt b/Utilities/cmexpat/CMakeLists.txt
index 9a62b79..81dfee3 100644
--- a/Utilities/cmexpat/CMakeLists.txt
+++ b/Utilities/cmexpat/CMakeLists.txt
@@ -6,6 +6,12 @@ ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
ENDIF()
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(Linux)$")
+ add_definitions(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
+ string(APPEND CMAKE_REQUIRED_DEFINITIONS " -D_DEFAULT_SOURCE -D_BSD_SOURCE")
+endif()
+
include(ConfigureChecks.cmake)
configure_file(expat_config.h.cmake expat_config.h @ONLY)