Index: /issm/trunk-jpl/externalpackages/gsl/install-javascript.sh
===================================================================
--- /issm/trunk-jpl/externalpackages/gsl/install-javascript.sh	(revision 20996)
+++ /issm/trunk-jpl/externalpackages/gsl/install-javascript.sh	(revision 20997)
@@ -22,4 +22,7 @@
 export CXX=em++
 
+# Issue with variadic function signatures.
+export CFLAGS=-DSTDC_HEADERS
+
 ./configure --prefix="$ISSM_DIR/externalpackages/gsl/install-javascript"