diff --git a/lib/helper.c b/lib/helper.c
index de91438..471d7c3 100644
--- a/lib/helper.c
+++ b/lib/helper.c
@@ -29,12 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _POSIX_SOURCE
-#define /* glibc 2.19 and earlier */ _BSD_SOURCE || \
-	/* Since glibc 2.20 */_DEFAULT_SOURCE || \
-	_XOPEN_SOURCE >= 500 || \
-	_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || \
-	/* Since glibc 2.10: */ _POSIX_C_SOURCE >= 200112L \
 
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/lib/ipmi_chassis.c b/lib/ipmi_chassis.c
index b034364..a78f295 100644
--- a/lib/ipmi_chassis.c
+++ b/lib/ipmi_chassis.c
@@ -29,8 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _SVID_SOURCE || _BSD_SOURCE || _POSIX_C_SOURCE >= 1 || \
-	_XOPEN_SOURCE || _POSIX_SOURCE
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/lib/ipmi_dcmi.c b/lib/ipmi_dcmi.c
index 6fd982f..6f4dc90 100755
--- a/lib/ipmi_dcmi.c
+++ b/lib/ipmi_dcmi.c
@@ -36,7 +36,6 @@
  * This code conforms to the 1.0 DCMI Specification
  *  released by Hari Ramachandran of the Intel Corporation
  */
-#define _BSD_SOURCE
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/lib/ipmi_event.c b/lib/ipmi_event.c
index bc32ae8..d1e2860 100644
--- a/lib/ipmi_event.c
+++ b/lib/ipmi_event.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _BSD_SOURCE
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/lib/ipmi_hpmfwupg.c b/lib/ipmi_hpmfwupg.c
index bbcffc0..c202ac9 100644
--- a/lib/ipmi_hpmfwupg.c
+++ b/lib/ipmi_hpmfwupg.c
@@ -30,10 +30,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _BSD_SOURCE || \
-	(_XOPEN_SOURCE >= 500 || \
-                       _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) && \
-	!(_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)
 
 #include <ipmitool/ipmi_intf.h>
 #include <ipmitool/ipmi_mc.h>
diff --git a/lib/ipmi_isol.c b/lib/ipmi_isol.c
index bc0b08b..84d7db8 100644
--- a/lib/ipmi_isol.c
+++ b/lib/ipmi_isol.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _XOPEN_SOURCE
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/lib/ipmi_main.c b/lib/ipmi_main.c
index 273a80a..43f2f0c 100644
--- a/lib/ipmi_main.c
+++ b/lib/ipmi_main.c
@@ -29,11 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _XOPEN_SOURCE 700
-#define _BSD_SOURCE || \
-	(_XOPEN_SOURCE >= 500 || \
-	_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) && \
-	!(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/lib/ipmi_sdr.c b/lib/ipmi_sdr.c
index b4eac1d..6795c9a 100644
--- a/lib/ipmi_sdr.c
+++ b/lib/ipmi_sdr.c
@@ -32,7 +32,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _BSD_SOURCE
 
 #include <string.h>
 
diff --git a/lib/ipmi_sel.c b/lib/ipmi_sel.c
index 6b7301c..623556b 100644
--- a/lib/ipmi_sel.c
+++ b/lib/ipmi_sel.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _BSD_SOURCE
 
 #include <string.h>
 #include <strings.h>
diff --git a/lib/ipmi_sol.c b/lib/ipmi_sol.c
index 3acd5bb..4ac4e01 100644
--- a/lib/ipmi_sol.c
+++ b/lib/ipmi_sol.c
@@ -29,11 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _XOPEN_SOURCE
-#define _BSD_SOURCE || \
-	(_XOPEN_SOURCE >= 500 || \
-                       _XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) && \
-	!(_POSIX_C_SOURCE >= 200809L || _XOPEN_SOURCE >= 700)
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/lib/ipmi_sunoem.c b/lib/ipmi_sunoem.c
index ecbcbd9..e30f4da 100644
--- a/lib/ipmi_sunoem.c
+++ b/lib/ipmi_sunoem.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _XOPEN_SOURCE
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/lib/ipmi_tsol.c b/lib/ipmi_tsol.c
index d89bcfd..0d2235c 100644
--- a/lib/ipmi_tsol.c
+++ b/lib/ipmi_tsol.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _DEFAULT_SOURCE
 
 #include <sys/types.h>
 #include <sys/stat.h>
diff --git a/lib/ipmi_user.c b/lib/ipmi_user.c
index cbbe3d5..eb0dff9 100644
--- a/lib/ipmi_user.c
+++ b/lib/ipmi_user.c
@@ -29,10 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _BSD_SOURCE || \
-	(_XOPEN_SOURCE >= 500 || \
-	_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED) && \
-	!(_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)
 
 #include <stdlib.h>
 #include <string.h>
diff --git a/lib/log.c b/lib/log.c
index 2738e18..50352cb 100644
--- a/lib/log.c
+++ b/lib/log.c
@@ -29,9 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 || \
-	_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || \
-	/* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
 
 #include <unistd.h>
 #include <stdio.h>
diff --git a/src/ipmievd.c b/src/ipmievd.c
index 870bc9d..a0ffa6b 100644
--- a/src/ipmievd.c
+++ b/src/ipmievd.c
@@ -29,8 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _XOPEN_SOURCE 700
-#define _BSD_SOURCE
 
 #include <stdio.h>
 #include <fcntl.h>
diff --git a/src/ipmishell.c b/src/ipmishell.c
index 205cbf9..6cfcbe8 100644
--- a/src/ipmishell.c
+++ b/src/ipmishell.c
@@ -29,9 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 || \
-	_XOPEN_SOURCE && _XOPEN_SOURCE_EXTENDED || \
-	/* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L
 
 #include <stdio.h>
 #include <unistd.h>
diff --git a/src/plugins/ipmi_intf.c b/src/plugins/ipmi_intf.c
index 9225a34..07d6707 100644
--- a/src/plugins/ipmi_intf.c
+++ b/src/plugins/ipmi_intf.c
@@ -29,9 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _XOPEN_SOURCE 700
-#define _GNU_SOURCE 1
-#define _DARWIN_C_SOURCE 1
 
 #include <stdio.h>
 #include <stdlib.h>
diff --git a/src/plugins/lan/lan.c b/src/plugins/lan/lan.c
index 40ba233..6acde16 100644
--- a/src/plugins/lan/lan.c
+++ b/src/plugins/lan/lan.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _GNU_SOURCE
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/src/plugins/lanplus/lanplus.c b/src/plugins/lanplus/lanplus.c
index a0e388c..eb69512 100644
--- a/src/plugins/lanplus/lanplus.c
+++ b/src/plugins/lanplus/lanplus.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _GNU_SOURCE
 
 #include <stdlib.h>
 #include <stdio.h>
diff --git a/src/plugins/open/open.c b/src/plugins/open/open.c
index 59b736d..3c95058 100644
--- a/src/plugins/open/open.c
+++ b/src/plugins/open/open.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _POSIX_C_SOURCE 1
 
 #include <stdio.h>
 #include <fcntl.h>
diff --git a/src/plugins/serial/serial_basic.c b/src/plugins/serial/serial_basic.c
index 21a239a..b455959 100644
--- a/src/plugins/serial/serial_basic.c
+++ b/src/plugins/serial/serial_basic.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF PPS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _GNU_SOURCE 1
 
 /* Serial Interface, Basic Mode plugin. */
 
diff --git a/src/plugins/serial/serial_terminal.c b/src/plugins/serial/serial_terminal.c
index 4459f64..d4c4972 100644
--- a/src/plugins/serial/serial_terminal.c
+++ b/src/plugins/serial/serial_terminal.c
@@ -29,7 +29,6 @@
  * LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
  * EVEN IF PPS HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
  */
-#define _GNU_SOURCE 1
 
 /* Serial Interface, Terminal Mode plugin. */
 
diff --git a/src/plugins/usb/usb.c b/src/plugins/usb/usb.c
index 0049400..5046ed2 100644
--- a/src/plugins/usb/usb.c
+++ b/src/plugins/usb/usb.c
@@ -30,8 +30,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#define _BSD_SOURCE
-
 #include <ipmitool/helper.h>
 #include <ipmitool/log.h>
 #include <ipmitool/bswap.h>