diff --git a/RELICENSE/cwsmith.md b/RELICENSE/cwsmith.md
new file mode 100644
index 00000000..2292f335
--- /dev/null
+++ b/RELICENSE/cwsmith.md
@@ -0,0 +1,13 @@
+# Permission to Relicense under MPLv2
+
+This is a statement by Cameron Smith
+that grants permission to relicense its copyrights in the libzmq C++
+library (ZeroMQ) under the Mozilla Public License v2 (MPLv2).
+
+A portion of the commits made by the Github handle "cwsmith", with
+commit author "Cameron Smith <smithc11@rpi.edu>", are copyright of Cameron Smith.
+This document hereby grants the libzmq project team to relicense libzmq,
+including all past, present and future contributions of the author listed above.
+
+Cameron Smith
+2020/02/05
diff --git a/src/err.hpp b/src/err.hpp
index ed26a65e..3f3278f8 100644
--- a/src/err.hpp
+++ b/src/err.hpp
@@ -59,6 +59,8 @@ const char *errno_to_string (int errno_);
 #if defined __clang__
 #if __has_feature(attribute_analyzer_noreturn)
 void zmq_abort (const char *errmsg_) __attribute__ ((analyzer_noreturn));
+#else
+void zmq_abort (const char *errmsg_);
 #endif
 #elif defined __MSCVER__
 __declspec(noreturn) void zmq_abort (const char *errmsg_);