--- rxvt-unicode/configure	2021/11/07 14:13:40	1.169
+++ rxvt-unicode/configure	2023/01/02 17:16:42	1.175
@@ -4355,11 +4355,11 @@
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to enable C++11 features" >&5
 printf %s "checking for $CXX option to enable C++11 features... " >&6; }
-if test ${ac_cv_prog_cxx_cxx11+y}
+if test ${ac_cv_prog_cxx_11+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
-  ac_cv_prog_cxx_cxx11=no
+  ac_cv_prog_cxx_11=no
 ac_save_CXX=$CXX
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -4401,11 +4401,11 @@
 then :
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $CXX option to enable C++98 features" >&5
 printf %s "checking for $CXX option to enable C++98 features... " >&6; }
-if test ${ac_cv_prog_cxx_cxx98+y}
+if test ${ac_cv_prog_cxx_98+y}
 then :
   printf %s "(cached) " >&6
 else $as_nop
-  ac_cv_prog_cxx_cxx98=no
+  ac_cv_prog_cxx_98=no
 ac_save_CXX=$CXX
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
@@ -4729,10 +4729,6 @@
 ac_compiler_gnu=$ac_cv_cxx_compiler_gnu
 
 
-if test "$ac_prog_cxx_stdcxx" != cxx11; then
-  as_fn_error $? "the compiler does not support C++11" "$LINENO" 5
-fi
-
 LINKER="$CXX"
 if test x$GCC = xyes && test x$GXX = xyes; then
       { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for working libsupc++" >&5
@@ -5086,7 +5082,15 @@
 if test x$GXX = xyes; then
   if test $support_warnings = yes; then
     save_CXXFLAGS="$CXXFLAGS"
-    CXXFLAGS="$CXXFLAGS -Wall -Wno-sign-compare -Wno-reorder -Wno-unused-value"
+    for warning in \
+      -Wall \
+      -Wno-parentheses \
+      -Wno-reorder \
+      -Wno-sign-compare \
+      -Wno-unused-value \
+      ; do
+      CXXFLAGS="$CXXFLAGS $warning"
+    done
     cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
 
@@ -6842,8 +6846,8 @@
 
 
 
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for libptytty" >&5
-printf %s "checking for libptytty... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for libptytty (using pkg-config)" >&5
+printf %s "checking for libptytty (using pkg-config)... " >&6; }
   if test $PKG_CONFIG != no && $PKG_CONFIG --exists libptytty; then
     PTYTTY_CFLAGS="`$PKG_CONFIG --cflags libptytty`"
     PTYTTY_LIBS="`$PKG_CONFIG --libs libptytty`"
@@ -6870,8 +6874,8 @@
 
 if test x$support_pixbuf = xyes; then
 
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for gdk-pixbuf-2.0" >&5
-printf %s "checking for gdk-pixbuf-2.0... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for gdk-pixbuf-2.0 (using pkg-config)" >&5
+printf %s "checking for gdk-pixbuf-2.0 (using pkg-config)... " >&6; }
   if test $PKG_CONFIG != no && $PKG_CONFIG --exists gdk-pixbuf-2.0; then
     PIXBUF_CFLAGS="`$PKG_CONFIG --cflags gdk-pixbuf-2.0`"
     PIXBUF_LIBS="`$PKG_CONFIG --libs gdk-pixbuf-2.0`"
@@ -6900,8 +6904,8 @@
 
 if test x$support_startup_notification = xyes; then
 
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for libstartup-notification-1.0" >&5
-printf %s "checking for libstartup-notification-1.0... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for libstartup-notification-1.0 (using pkg-config)" >&5
+printf %s "checking for libstartup-notification-1.0 (using pkg-config)... " >&6; }
   if test $PKG_CONFIG != no && $PKG_CONFIG --exists libstartup-notification-1.0; then
     STARTUP_NOTIFICATION_CFLAGS="`$PKG_CONFIG --cflags libstartup-notification-1.0`"
     STARTUP_NOTIFICATION_LIBS="`$PKG_CONFIG --libs libstartup-notification-1.0`"
@@ -6926,8 +6930,8 @@
 
 if test x$support_frills = xyes; then
 
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for xmu" >&5
-printf %s "checking for xmu... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for xmu (using pkg-config)" >&5
+printf %s "checking for xmu (using pkg-config)... " >&6; }
   if test $PKG_CONFIG != no && $PKG_CONFIG --exists xmu; then
     XMU_CFLAGS="`$PKG_CONFIG --cflags xmu`"
     XMU_LIBS="`$PKG_CONFIG --libs xmu`"
@@ -7461,8 +7465,8 @@
 if test x$support_xft = xyes || test x$support_image = xyes; then
   rxvt_have_xrender=no
 
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for xrender" >&5
-printf %s "checking for xrender... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for xrender (using pkg-config)" >&5
+printf %s "checking for xrender (using pkg-config)... " >&6; }
   if test $PKG_CONFIG != no && $PKG_CONFIG --exists xrender; then
     XRENDER_CFLAGS="`$PKG_CONFIG --cflags xrender`"
     XRENDER_LIBS="`$PKG_CONFIG --libs xrender`"
@@ -7504,8 +7508,8 @@
 
 if test x$support_xft = xyes && test x$rxvt_have_xrender = xyes; then
 
-  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for fontconfig xft" >&5
-printf %s "checking for fontconfig xft... " >&6; }
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for fontconfig xft (using pkg-config)" >&5
+printf %s "checking for fontconfig xft (using pkg-config)... " >&6; }
   if test $PKG_CONFIG != no && $PKG_CONFIG --exists fontconfig xft; then
     XFT_CFLAGS="`$PKG_CONFIG --cflags fontconfig xft`"
     XFT_LIBS="`$PKG_CONFIG --libs fontconfig xft`"
@@ -7828,6 +7832,28 @@
 
 
 
+
+  { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for xext (using pkg-config)" >&5
+printf %s "checking for xext (using pkg-config)... " >&6; }
+  if test $PKG_CONFIG != no && $PKG_CONFIG --exists xext; then
+    XEXT_CFLAGS="`$PKG_CONFIG --cflags xext`"
+    XEXT_LIBS="`$PKG_CONFIG --libs xext`"
+
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: ok" >&5
+printf "%s\n" "ok" >&6; }
+    :
+  else
+    { printf "%s\n" "$as_me:${as_lineno-$LINENO}: result: no" >&5
+printf "%s\n" "no" >&6; }
+
+    as_fn_error $? "unable to find xext, required for perl" "$LINENO" 5
+
+  fi
+
+
+  X_LIBS="$XEXT_LIBS $X_LIBS"
+  CPPFLAGS="$CPPFLAGS $XEXT_CFLAGS"
+
   { printf "%s\n" "$as_me:${as_lineno-$LINENO}: checking for $PERL suitability" >&5
 printf %s "checking for $PERL suitability... " >&6; }
   if $PERL -MExtUtils::Embed -e "use v5.8" >/dev/null 2>/dev/null; then