From: Hans Petter Jansson <hpj@copyleft.no>
      Wolfgang Rosenauer <wr@rosenauer.org>
Subject: use libnsssharedhelper if available at compile time
         (can be disabled by exporting MOZ_XRE_NO_NSSHELPER=1)
References:

diff --git a/configure.in b/configure.in
--- a/configure.in
+++ b/configure.in
@@ -6444,16 +6444,31 @@ AC_SUBST(QCMS_LIBS)
 
 dnl ========================================================
 dnl HarfBuzz
 dnl ========================================================
 MOZ_HARFBUZZ_LIBS='$(DEPTH)/mozilla/gfx/harfbuzz/src/$(LIB_PREFIX)mozharfbuzz.$(LIB_SUFFIX)'
 AC_SUBST(MOZ_HARFBUZZ_LIBS)
 
 dnl ========================================================
+dnl Check for nss-shared-helper
+dnl ========================================================
+
+  PKG_CHECK_MODULES(NSSHELPER, nss-shared-helper, 
+   [MOZ_ENABLE_NSSHELPER=1],
+   [MOZ_ENABLE_NSSHELPER=])
+
+if test "$MOZ_ENABLE_NSSHELPER"; then
+  AC_DEFINE(MOZ_ENABLE_NSSHELPER)
+fi
+AC_SUBST(MOZ_ENABLE_NSSHELPER)
+AC_SUBST(NSSHELPER_CFLAGS)
+AC_SUBST(NSSHELPER_LIBS)
+
+dnl ========================================================
 dnl disable xul
 dnl ========================================================
 MOZ_ARG_DISABLE_BOOL(xul,
 [  --disable-xul           Disable XUL],
     MOZ_XUL= )
 if test "$MOZ_XUL"; then
   AC_DEFINE(MOZ_XUL)
 fi
diff --git a/mail/app/Makefile.in b/mail/app/Makefile.in
--- a/mail/app/Makefile.in
+++ b/mail/app/Makefile.in
@@ -61,16 +61,17 @@ LOCAL_INCLUDES += \
   $(NULL)
 
 DEFINES += -DXPCOM_GLUE
 STL_FLAGS=
 
 LIBS += \
 	$(EXTRA_DSO_LIBS) \
 	$(XPCOM_STANDALONE_GLUE_LDOPTS) \
+	$(NSSHELPER_LIBS) \
 	$(NULL)
 
 ifdef MOZ_LINKER
 LIBS += $(MOZ_ZLIB_LIBS)
 endif
 
 ifndef MOZ_WINCONSOLE
 ifdef MOZ_DEBUG