# _AC_PROG_GREP(VARIABLE, PROGNAME-LIST, PROG-ARGUMENTS)
+# ------------------------------------------------------
+# Solaris 9 /usr/xpg4/bin/*grep is suitable, but /usr/bin/*grep lacks -e
+# AIX silently truncates long lines before matching
+# NeXT understands only one -e and truncates long lines
 m4_define([_AC_PROG_GREP],
 [_AC_PATH_PROG_FEATURE_CHECK([$1], [$2],
        [_AC_FEATURE_CHECK_LENGTH([ac_path_$1], [ac_cv_path_$1],
-               ["$ac_path_$1" $3], [$1])],
-       dnl Add /usr/xpg4/bin/*grep as it is typically found on Solaris
-       dnl along with a /usr/bin/*grep that lacks -e.
-       [$PATH:/usr/xpg4/bin])
+               ["$ac_path_$1" $3], [$1])], [$PATH:/usr/xpg4/bin])
 ])