-# A/UX needs this.
-AC_CHECK_LIB(UTIL,memmove)
-# needed on solaris. GNU libc also has a libnsl, but we do not need it.
-AC_SEARCH_LIBS(gethostbyname,nsl)
-AC_CHECK_LIB(socket,bind)
+# memmove: A/UX libUTIL
+AC_SEARCH_LIBS([memmove], [UTIL], [], [
+ AC_MSG_ERROR([unable to find the memmove() function])
+])
+# gethostbyname: Solaris libnsl
+AC_SEARCH_LIBS([gethostbyname], [nsl], [], [
+ AC_MSG_ERROR([unable to find the gethostbyname() function])
+])
+# bind: SVR4 libsocket
+AC_SEARCH_LIBS([bind], [socket], [], [
+ AC_MSG_ERROR([unable to find the bind() function])
+])