4 files changed, 40 insertions, 0 deletions
diff --git a/Utilities/cmbzip2/CMakeLists.txt b/Utilities/cmbzip2/CMakeLists.txt
index 52efe14..1d7b265 100644
--- a/Utilities/cmbzip2/CMakeLists.txt
+++ b/Utilities/cmbzip2/CMakeLists.txt
@@ -8,6 +8,14 @@ elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 endif()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(AIX|OS400)$")
+  add_definitions(-D_ALL_SOURCE)
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+endif()
+
 add_definitions(-D_FILE_OFFSET_BITS=64)
 add_library(cmbzip2
   blocksort.c huffman.c crctable.c randtable.c compress.c decompress.c bzlib.c)
diff --git a/Utilities/cmcurl/CMakeLists.txt b/Utilities/cmcurl/CMakeLists.txt
index 2c0e873..f842270 100644
--- a/Utilities/cmcurl/CMakeLists.txt
+++ b/Utilities/cmcurl/CMakeLists.txt
@@ -119,6 +119,20 @@ elseif(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 endif()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(AIX|OS400)$")
+  add_definitions(-D_ALL_SOURCE)
+endif()
+if(CMAKE_SYSTEM_NAME MATCHES "^(Linux)$")
+  add_definitions(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
+endif()
+if(CMAKE_SYSTEM_NAME MATCHES "^(SunOS)$")
+  add_definitions(-D__EXTENSIONS__)
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+endif()
+
 #***************************************************************************
 #                                  _   _ ____  _
 #  Project                     ___| | | |  _ \| |
diff --git a/Utilities/cmlibarchive/CMakeLists.txt b/Utilities/cmlibarchive/CMakeLists.txt
index 9ab7cec..eea472f 100644
--- a/Utilities/cmlibarchive/CMakeLists.txt
+++ b/Utilities/cmlibarchive/CMakeLists.txt
@@ -103,6 +103,16 @@ ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 ENDIF()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(Linux)$")
+  add_definitions(-D_DEFAULT_SOURCE -D_BSD_SOURCE)
+  string(APPEND CMAKE_REQUIRED_DEFINITIONS " -D_DEFAULT_SOURCE -D_BSD_SOURCE")
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+  string(APPEND CMAKE_REQUIRED_DEFINITIONS " -D_XOPEN_SOURCE=600")
+endif()
+
 IF(0) # CMake does not need flags specific to libarchive upstream development.
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")
   OPTION(ENABLE_WERROR "Treat warnings as errors - default is ON for Debug, OFF otherwise." ON)
diff --git a/Utilities/cmliblzma/CMakeLists.txt b/Utilities/cmliblzma/CMakeLists.txt
index 0de1e97..3121fbe 100644
--- a/Utilities/cmliblzma/CMakeLists.txt
+++ b/Utilities/cmliblzma/CMakeLists.txt
@@ -166,6 +166,14 @@ ELSEIF(CMAKE_C_COMPILER_ID STREQUAL "PathScale")
   SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -woffall")
 ENDIF()
 
+# Activate POSIX APIs.
+if(CMAKE_SYSTEM_NAME MATCHES "^(AIX|OS400)$")
+  add_definitions(-D_ALL_SOURCE)
+endif()
+if(NOT CMAKE_SYSTEM_NAME MATCHES "BSD|Darwin|Windows")
+  add_definitions(-D_XOPEN_SOURCE=600)
+endif()
+
 ADD_LIBRARY(cmliblzma STATIC ${LZMA_SRCS})
 
 IF(CMAKE_C_COMPILER_ID STREQUAL "XL")