diff -u ucblogo-6.0/configure ucblogo-6.0m/configure
--- ucblogo-6.0/configure	2008-06-08 18:02:30.000000000 -0600
+++ ucblogo-6.0m/configure	2019-08-30 10:14:32.368915525 -0600
@@ -1820,7 +1820,7 @@
 fi
 
 
-for ac_func in usleep srandom sigvec sigsetmask matherr drem irint bcopy memcpy
+for ac_func in usleep srandom sigvec sigsetmask drem irint bcopy memcpy
 do
 echo $ac_n "checking for $ac_func""... $ac_c" 1>&6
 if eval "test \"`echo '$''{'ac_cv_func_$ac_func'+set}'`\" = set"; then
diff -u ucblogo-6.0/configure.in ucblogo-6.0m/configure.in
--- ucblogo-6.0/configure.in	2007-11-18 15:08:58.000000000 -0700
+++ ucblogo-6.0m/configure.in	2019-08-30 10:19:23.847099812 -0600
@@ -38,7 +38,7 @@
 AC_TYPE_SIGNAL
 
 dnl Checks for library functions.
-AC_CHECK_FUNCS(usleep srandom sigvec sigsetmask matherr drem irint memcpy)
+AC_CHECK_FUNCS(usleep srandom sigvec sigsetmask drem irint memcpy)
 AC_PROG_GCC_TRADITIONAL
 dnl AC_TYPE_SIGNAL