diff --git a/acinclude.m4 b/acinclude.m4
index 5a99c8d..10f05df 100644
--- a/acinclude.m4
+++ b/acinclude.m4
@@ -2681,34 +2681,6 @@ AC_DEFUN(AC_CHECK_BOOL,
   AC_DEFINE_UNQUOTED(HAVE_BOOL, 1, [You _must_ have bool])
 ])
 
-AC_DEFUN(AC_CHECK_GNU_EXTENSIONS,
-[
-AC_MSG_CHECKING(if you need GNU extensions)
-AC_CACHE_VAL(ac_cv_gnu_extensions,
-[
-cat > conftest.c << EOF
-#include <features.h>
-
-#ifdef __GNU_LIBRARY__
-yes
-#endif
-EOF
-
-if (eval "$ac_cpp conftest.c") 2>&5 |
-  egrep "yes" >/dev/null 2>&1; then
-  rm -rf conftest*
-  ac_cv_gnu_extensions=yes
-else
-  ac_cv_gnu_extensions=no
-fi
-])
-
-AC_MSG_RESULT($ac_cv_gnu_extensions)
-if test "$ac_cv_gnu_extensions" = "yes"; then
-  AC_DEFINE_UNQUOTED(_GNU_SOURCE, 1, [Define if you need to use the GNU extensions])
-fi
-])
-
 AC_DEFUN(KDE_CHECK_COMPILER_FLAG,
 [
 AC_MSG_CHECKING([whether $CXX supports -$1])
@@ -2901,8 +2873,8 @@ AC_DEFUN(AC_CHECK_COMPILERS,
       if test "$GCC" = "yes"; then
         case $host in
           *-*-linux-gnu)	
-            CFLAGS="-ansi -W -Wall -pedantic -Wchar-subscripts -Wshadow -Wpointer-arith -Wmissing-prototypes -Wwrite-strings -D_XOPEN_SOURCE=500 -D_BSD_SOURCE $CFLAGS"
-            CXXFLAGS="-ansi -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -Wcast-align -Wconversion -Wchar-subscripts $CXXFLAGS"
+            CFLAGS="-ansi -W -Wall -pedantic -Wchar-subscripts -Wshadow -Wpointer-arith -Wmissing-prototypes -Wwrite-strings -D_XOPEN_SOURCE=500 -D_DEFAULT_SOURCE $CFLAGS"
+            CXXFLAGS="-ansi -D_XOPEN_SOURCE=500 -D_DEFAULT_SOURCE -Wcast-align -Wconversion -Wchar-subscripts $CXXFLAGS"
             KDE_CHECK_COMPILER_FLAG(Wmissing-format-attribute, [CXXFLAGS="$CXXFLAGS -Wformat-security -Wmissing-format-attribute"; CFLAGS="$CFLAGS -Wformat-security -Wmissing-format-attribute"])
           ;;
         esac
diff --git a/aclocal.m4 b/aclocal.m4
index 6dbdf31..4ecd72a 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -2693,34 +2693,6 @@ AC_DEFUN(AC_CHECK_BOOL,
   AC_DEFINE_UNQUOTED(HAVE_BOOL, 1, [You _must_ have bool])
 ])
 
-AC_DEFUN(AC_CHECK_GNU_EXTENSIONS,
-[
-AC_MSG_CHECKING(if you need GNU extensions)
-AC_CACHE_VAL(ac_cv_gnu_extensions,
-[
-cat > conftest.c << EOF
-#include <features.h>
-
-#ifdef __GNU_LIBRARY__
-yes
-#endif
-EOF
-
-if (eval "$ac_cpp conftest.c") 2>&5 |
-  egrep "yes" >/dev/null 2>&1; then
-  rm -rf conftest*
-  ac_cv_gnu_extensions=yes
-else
-  ac_cv_gnu_extensions=no
-fi
-])
-
-AC_MSG_RESULT($ac_cv_gnu_extensions)
-if test "$ac_cv_gnu_extensions" = "yes"; then
-  AC_DEFINE_UNQUOTED(_GNU_SOURCE, 1, [Define if you need to use the GNU extensions])
-fi
-])
-
 AC_DEFUN(KDE_CHECK_COMPILER_FLAG,
 [
 AC_MSG_CHECKING([whether $CXX supports -$1])
@@ -2913,8 +2885,8 @@ AC_DEFUN(AC_CHECK_COMPILERS,
       if test "$GCC" = "yes"; then
         case $host in
           *-*-linux-gnu)	
-            CFLAGS="-ansi -W -Wall -pedantic -Wchar-subscripts -Wshadow -Wpointer-arith -Wmissing-prototypes -Wwrite-strings -D_XOPEN_SOURCE=500 -D_BSD_SOURCE $CFLAGS"
-            CXXFLAGS="-ansi -D_XOPEN_SOURCE=500 -D_BSD_SOURCE -Wcast-align -Wconversion -Wchar-subscripts $CXXFLAGS"
+            CFLAGS="-ansi -W -Wall -pedantic -Wchar-subscripts -Wshadow -Wpointer-arith -Wmissing-prototypes -Wwrite-strings -D_XOPEN_SOURCE=500 -D_DEFAULT_SOURCE $CFLAGS"
+            CXXFLAGS="-ansi -D_XOPEN_SOURCE=500 -D_DEFAULT_SOURCE -Wcast-align -Wconversion -Wchar-subscripts $CXXFLAGS"
             KDE_CHECK_COMPILER_FLAG(Wmissing-format-attribute, [CXXFLAGS="$CXXFLAGS -Wformat-security -Wmissing-format-attribute"; CFLAGS="$CFLAGS -Wformat-security -Wmissing-format-attribute"])
           ;;
         esac