diff -up libsoup-2.48.1/libsoup/Makefile.am.check libsoup-2.48.1/libsoup/Makefile.am
--- libsoup-2.48.1/libsoup/Makefile.am.check	2015-05-26 08:43:08.168859956 -0400
+++ libsoup-2.48.1/libsoup/Makefile.am	2015-05-26 08:43:35.820163943 -0400
@@ -304,6 +304,6 @@ check-local:
 	@nm $(builddir)/.libs/libsoup-2.4.so | \
 		grep "^[[:xdigit:]]\+ [BTR] " | \
 		sed "s/^[[:xdigit:]]\+ [BTR] //" | \
-		env LANG=C sort -u | \
+		env LC_ALL=C sort -u | \
 		diff -U0 $(srcdir)/libsoup-2.4.sym - >&2
 endif
diff -up libsoup-2.48.1/libsoup/Makefile.in.check libsoup-2.48.1/libsoup/Makefile.in
--- libsoup-2.48.1/libsoup/Makefile.in.check	2015-05-26 08:43:03.639973945 -0400
+++ libsoup-2.48.1/libsoup/Makefile.in	2015-05-26 08:43:29.239329595 -0400
@@ -1230,7 +1230,7 @@ include $(INTROSPECTION_MAKEFILE)
 @OS_LINUX_TRUE@	@nm $(builddir)/.libs/libsoup-2.4.so | \
 @OS_LINUX_TRUE@		grep "^[[:xdigit:]]\+ [BTR] " | \
 @OS_LINUX_TRUE@		sed "s/^[[:xdigit:]]\+ [BTR] //" | \
-@OS_LINUX_TRUE@		env LANG=C sort -u | \
+@OS_LINUX_TRUE@		env LC_ALL=C sort -u | \
 @OS_LINUX_TRUE@		diff -U0 $(srcdir)/libsoup-2.4.sym - >&2
 
 # Tell versions [3.59,3.63) of GNU make to not export all variables.