diff --git a/nsprpub/configure b/nsprpub/configure
index 9a74f99a357d..3ea8213806d5 100755
--- a/nsprpub/configure
+++ b/nsprpub/configure
@@ -3810,19 +3810,7 @@ EOF
 EOF
 
     cat >> confdefs.h <<\EOF
-#define _POSIX_SOURCE 1
-EOF
-
-    cat >> confdefs.h <<\EOF
-#define _BSD_SOURCE 1
-EOF
-
-    cat >> confdefs.h <<\EOF
-#define _SVID_SOURCE 1
-EOF
-
-    cat >> confdefs.h <<\EOF
-#define _LARGEFILE64_SOURCE 1
+#define _GNU_SOURCE 1
 EOF
 
     cat >> confdefs.h <<\EOF
@@ -3837,8 +3825,8 @@ EOF
 
         ;;
     esac
-    CFLAGS="$CFLAGS -ansi -Wall"
-    CXXFLAGS="$CXXFLAGS -ansi -Wall"
+    CFLAGS="$CFLAGS -Wall"
+    CXXFLAGS="$CXXFLAGS -Wall"
     MDCPUCFG_H=_linux.cfg
     PR_MD_CSRCS=linux.c
     MKSHLIB='$(CC) $(DSO_LDOPTS) -o $@'
@@ -4416,17 +4404,17 @@ EOF
         _OPTIMIZE_FLAGS="$_OPTIMIZE_FLAGS -Olimit 4000"
         ac_safe=`echo "machine/builtins.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for machine/builtins.h""... $ac_c" 1>&6
-echo "configure:4420: checking for machine/builtins.h" >&5
+echo "configure:4408: checking for machine/builtins.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 4425 "configure"
+#line 4413 "configure"
 #include "confdefs.h"
 #include <machine/builtins.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:4430: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:4418: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -4988,7 +4976,7 @@ case $target in
     ;;
 *)
     echo $ac_n "checking for dlopen in -ldl""... $ac_c" 1>&6
-echo "configure:4992: checking for dlopen in -ldl" >&5
+echo "configure:4980: checking for dlopen in -ldl" >&5
 ac_lib_var=`echo dl'_'dlopen | sed 'y%./+-%__p_%'`
 if eval "test \"`echo '$''{'ac_cv_lib_$ac_lib_var'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
@@ -4996,7 +4984,7 @@ else
   ac_save_LIBS="$LIBS"
 LIBS="-ldl  $LIBS"
 cat > conftest.$ac_ext <<EOF
-#line 5000 "configure"
+#line 4988 "configure"
 #include "confdefs.h"
 /* Override any gcc2 internal prototype to avoid an error.  */
 /* We use char because int might match the return type of a gcc2
@@ -5007,7 +4995,7 @@ int main() {
 dlopen()
 ; return 0; }
 EOF
-if { (eval echo configure:5011: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:4999: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_lib_$ac_lib_var=yes"
 else
@@ -5024,17 +5012,17 @@ if eval "test \"`echo '$ac_cv_lib_'$ac_lib_var`\" = yes"; then
   echo "$ac_t""yes" 1>&6
   ac_safe=`echo "dlfcn.h" | sed 'y%./+-%__p_%'`
 echo $ac_n "checking for dlfcn.h""... $ac_c" 1>&6
-echo "configure:5028: checking for dlfcn.h" >&5
+echo "configure:5016: checking for dlfcn.h" >&5
 if eval "test \"`echo '$''{'ac_cv_header_$ac_safe'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5033 "configure"
+#line 5021 "configure"
 #include "confdefs.h"
 #include <dlfcn.h>
 EOF
 ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out"
-{ (eval echo configure:5038: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
+{ (eval echo configure:5026: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; }
 ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"`
 if test -z "$ac_err"; then
   rm -rf conftest*
@@ -5067,13 +5055,13 @@ esac
 
 if test $ac_cv_prog_gcc = yes; then
     echo $ac_n "checking whether ${CC-cc} needs -traditional""... $ac_c" 1>&6
-echo "configure:5071: checking whether ${CC-cc} needs -traditional" >&5
+echo "configure:5059: checking whether ${CC-cc} needs -traditional" >&5
 if eval "test \"`echo '$''{'ac_cv_prog_gcc_traditional'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
     ac_pattern="Autoconf.*'x'"
   cat > conftest.$ac_ext <<EOF
-#line 5077 "configure"
+#line 5065 "configure"
 #include "confdefs.h"
 #include <sgtty.h>
 Autoconf TIOCGETP
@@ -5091,7 +5079,7 @@ rm -f conftest*
 
   if test $ac_cv_prog_gcc_traditional = no; then
     cat > conftest.$ac_ext <<EOF
-#line 5095 "configure"
+#line 5083 "configure"
 #include "confdefs.h"
 #include <termio.h>
 Autoconf TCGETA
@@ -5115,12 +5103,12 @@ fi
 for ac_func in lchown strerror
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
-echo "configure:5119: checking for $ac_func" >&5
+echo "configure:5107: checking for $ac_func" >&5
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
   cat > conftest.$ac_ext <<EOF
-#line 5124 "configure"
+#line 5112 "configure"
 #include "confdefs.h"
 /* System header to define __stub macros and hopefully few prototypes,
     which can conflict with char $ac_func(); below.  */
@@ -5143,7 +5131,7 @@ $ac_func();
 
 ; return 0; }
 EOF
-if { (eval echo configure:5147: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
+if { (eval echo configure:5135: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then
   rm -rf conftest*
   eval "ac_cv_func_$ac_func=yes"
 else
@@ -5184,7 +5172,7 @@ hpux*)
 if test -z "$GNU_CC"; then
 
     echo $ac_n "checking for +Olit support""... $ac_c" 1>&6
-echo "configure:5188: checking for +Olit support" >&5
+echo "configure:5176: checking for +Olit support" >&5
 if eval "test \"`echo '$''{'ac_cv_hpux_usable_olit_option'+set}'`\" = set"; then
   echo $ac_n "(cached) $ac_c" 1>&6
 else
@@ -5223,7 +5211,7 @@ darwin*)
 *)
     
 echo $ac_n "checking for pthread_create in -lpthreads""... $ac_c" 1>&6
-echo "configure:5227: checking for pthread_create in -lpthreads" >&5
+echo "configure:5215: checking for pthread_create in -lpthreads" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5245,7 +5233,7 @@ echo "
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lpthread""... $ac_c" 1>&6
-echo "configure:5249: checking for pthread_create in -lpthread" >&5
+echo "configure:5237: checking for pthread_create in -lpthread" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5267,7 +5255,7 @@ echo "
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lc_r""... $ac_c" 1>&6
-echo "configure:5271: checking for pthread_create in -lc_r" >&5
+echo "configure:5259: checking for pthread_create in -lc_r" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5289,7 +5277,7 @@ echo "
         echo "$ac_t""no" 1>&6
         
 echo $ac_n "checking for pthread_create in -lc""... $ac_c" 1>&6
-echo "configure:5293: checking for pthread_create in -lc" >&5
+echo "configure:5281: checking for pthread_create in -lc" >&5
 echo "
     #include <pthread.h> 
     void *foo(void *v) { return v; } 
@@ -5443,7 +5431,7 @@ if test -n "$USE_PTHREADS"; then
       rm -f conftest*
    ac_cv_have_dash_pthread=no
    echo $ac_n "checking whether ${CC-cc} accepts -pthread""... $ac_c" 1>&6
-echo "configure:5447: checking whether ${CC-cc} accepts -pthread" >&5
+echo "configure:5435: checking whether ${CC-cc} accepts -pthread" >&5
    echo 'int main() { return 0; }' | cat > conftest.c
    ${CC-cc} -pthread -o conftest conftest.c > conftest.out 2>&1
    if test $? -eq 0; then
@@ -5466,7 +5454,7 @@ echo "configure:5447: checking whether ${CC-cc} accepts -pthread" >&5
 			    ac_cv_have_dash_pthreads=no
     if test "$ac_cv_have_dash_pthread" = "no"; then
 	    echo $ac_n "checking whether ${CC-cc} accepts -pthreads""... $ac_c" 1>&6
-echo "configure:5470: checking whether ${CC-cc} accepts -pthreads" >&5
+echo "configure:5458: checking whether ${CC-cc} accepts -pthreads" >&5
     	echo 'int main() { return 0; }' | cat > conftest.c
 	    ${CC-cc} -pthreads -o conftest conftest.c > conftest.out 2>&1
     	if test $? -eq 0; then
diff --git a/nsprpub/configure.in b/nsprpub/configure.in
index c8657a4a60e2..e4276ef47e54 100644
--- a/nsprpub/configure.in
+++ b/nsprpub/configure.in
@@ -1342,18 +1342,15 @@ tools are selected during the Xcode/Developer Tools installation.])
         IMPL_STRATEGY=_PTH
     fi
     AC_DEFINE(XP_UNIX)
-    AC_DEFINE(_POSIX_SOURCE)
-    AC_DEFINE(_BSD_SOURCE)
-    AC_DEFINE(_SVID_SOURCE)
-    AC_DEFINE(_LARGEFILE64_SOURCE)
+    AC_DEFINE(_GNU_SOURCE)
     AC_DEFINE(HAVE_FCNTL_FILE_LOCKING)
     case "${target_os}" in
     linux*)
         AC_DEFINE(LINUX)
         ;;
     esac
-    CFLAGS="$CFLAGS -ansi -Wall"
-    CXXFLAGS="$CXXFLAGS -ansi -Wall"
+    CFLAGS="$CFLAGS -Wall"
+    CXXFLAGS="$CXXFLAGS -Wall"
     MDCPUCFG_H=_linux.cfg
     PR_MD_CSRCS=linux.c
     MKSHLIB='$(CC) $(DSO_LDOPTS) -o $@'
diff --git a/nsprpub/pr/src/linking/Makefile.in b/nsprpub/pr/src/linking/Makefile.in
index b6c3125c35a0..9b82aca205df 100644
--- a/nsprpub/pr/src/linking/Makefile.in
+++ b/nsprpub/pr/src/linking/Makefile.in
@@ -62,11 +62,6 @@ TARGETS	= $(OBJS)
 
 INCLUDES = -I$(dist_includedir) -I$(topsrcdir)/pr/include -I$(topsrcdir)/pr/include/private
 
-# For Dl_info and dladdr.
-ifeq (,$(filter-out Linux GNU GNU_%,$(OS_TARGET)))
-DEFINES    += -D_GNU_SOURCE
-endif
-
 # On Mac OS X use flat #includes.
 ifeq ($(OS_TARGET),MacOSX)
 INCLUDES    += -I$(MACOS_SDK_DIR)/Developer/Headers/FlatCarbon
diff --git a/nsprpub/pr/src/pthreads/Makefile.in b/nsprpub/pr/src/pthreads/Makefile.in
index ddda70916afc..006a3e8cbcce 100644
--- a/nsprpub/pr/src/pthreads/Makefile.in
+++ b/nsprpub/pr/src/pthreads/Makefile.in
@@ -67,11 +67,6 @@ INCLUDES = -I$(dist_includedir) -I$(topsrcdir)/pr/include -I$(topsrcdir)/pr/incl
 
 DEFINES	+= -D_NSPR_BUILD_
 
-ifeq ($(OS_ARCH),Linux)
-# for pthread_mutexattr_settype
-DEFINES += -D_XOPEN_SOURCE=500
-endif
-
 include $(topsrcdir)/config/rules.mk
 
 export:: $(TARGETS)