diff -Nrup a/Makefile.am b/Makefile.am
--- a/Makefile.am 2008-03-10 16:47:14.000000000 -0600
+++ b/Makefile.am 2019-12-19 23:38:15.471358392 -0700
@@ -6,7 +6,7 @@ bin_PROGRAMS = echoping
man_MANS = echoping.1
echoping_SOURCES = echoping.c error.c readline.c writen.c util.c http.c icp.c HTParse.c echoping.h icp.h HTParse.h smtp.c
pkginclude_HEADERS = echoping.h compilation.h
-echoping_LDADD =
+echoping_LDADD = -lm
echoping_LDFLAGS = -export-dynamic
DOCS=DETAILS PLUGINS
SUBDIRS=plugins