diff --git a/configure.ac b/configure.ac
index 9163a6a6..0b2de6ff 100644
--- a/configure.ac
+++ b/configure.ac
@@ -52,6 +52,18 @@ AC_SUBST(GECKO_CFLAGS)
 
 AC_DEFINE([HAVE_GECKO_1_9],[1],[Define if we have gecko 1.9])
 
+PKG_CHECK_MODULES(NSPR, [nspr],
+  [have_nspr=true],
+  [
+PKG_CHECK_MODULES(NSPR, [mozilla-nspr],
+  [have_nspr=true],
+  have_nspr=false)
+  ])
+
+if test "x$have_nspr" = xfalse; then
+  AC_MSG_ERROR([Could not find nspr])
+fi
+
 else
 
 # xulrunner 1.8
diff --git a/lib/python/Makefile.am b/lib/python/Makefile.am
index 7d249501..a95299d1 100644
--- a/lib/python/Makefile.am
+++ b/lib/python/Makefile.am
@@ -4,6 +4,7 @@ INCLUDES =					\
 	$(PYCAIRO_CFLAGS)			\
 	$(LIB_CFLAGS)				\
 	$(GECKO_CFLAGS)				\
+	$(NSPR_CFLAGS)				\
 	-I$(MOZILLA_INCLUDE_DIR)/gtkembedmoz	\
 	-I$(top_srcdir)/lib/src
 
diff --git a/lib/src/Makefile.am b/lib/src/Makefile.am
index 407b4690..4fb34311 100644
--- a/lib/src/Makefile.am
+++ b/lib/src/Makefile.am
@@ -2,6 +2,7 @@ libsugarprivate_la_CPPFLAGS =				\
 	$(WARN_CFLAGS)					\
 	$(LIB_CFLAGS)					\
 	$(GECKO_CFLAGS)					\
+	$(NSPR_CFLAGS)					\
 	-I$(MOZILLA_INCLUDE_DIR)/dom			\
 	-I$(MOZILLA_INCLUDE_DIR)/exthandler		\
 	-I$(MOZILLA_INCLUDE_DIR)/gtkembedmoz		\