diff -aru aespipe-v2.4e-orig/configure aespipe-v2.4e/configure
--- aespipe-v2.4e-orig/configure	2017-09-10 13:52:14.000000000 +0200
+++ aespipe-v2.4e/configure	2019-08-19 00:38:25.116693673 +0200
@@ -5195,7 +5195,7 @@
 void ${label}(void){}
 
 _ACEOF
-if ${CC} ${CPPFLAGS} ${CFLAGS} -c conftest.c >/dev/null 2>&1 && ${NM_PROG} conftest.o | ${GREP} "_${label}" >/dev/null 2>&1; then
+if ${CC} ${CPPFLAGS} ${CFLAGS} -c conftest.c >/dev/null 2>&1 && ${NM_PROG} conftest.o | ${GREP} " _${label}" >/dev/null 2>&1; then
 	{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
 $as_echo "yes" >&6; }
 	$as_echo "#define USE_UNDERLINE 1" >>confdefs.h