Sigh. This should be a warning for now, not an error condition

configure

@@ -2641,7 +2641,7 @@ else
   echo "$ac_t""no" 1>&6
 fi
 
-for ac_prog in gawk mawk nawk awk
+for ac_prog in mawk gawk nawk awk
 do
 # Extract the first word of "$ac_prog", so it can be a program name with args.
 set dummy $ac_prog; ac_word=$2
@@ -2917,7 +2917,7 @@ test -n "$ZIP" && break
 done
 
 if test -z "$ZIP"; then
-    { echo "configure: error: zip not found in \$PATH. Disabling jar packaging" 1>&2; exit 1; }
+    echo "configure: warning: zip not found in \$PATH. Disabling jar packaging" 1>&2
     MOZ_DISABLE_JAR_PACKAGING=1
 fi
 # Extract the first word of "makedepend", so it can be a program name with args.

configure.in

@@ -307,7 +307,7 @@ AC_PATH_PROG(AUTOCONF, autoconf, :)
 AC_PATH_PROG(UNZIP, unzip, :)
 AC_PATH_PROGS(ZIP, zip)
 if test -z "$ZIP"; then
-    AC_MSG_ERROR([zip not found in \$PATH. Disabling jar packaging])
+    AC_MSG_WARN([zip not found in \$PATH. Disabling jar packaging])
     MOZ_DISABLE_JAR_PACKAGING=1
 fi
 AC_PATH_PROG(SYSTEM_MAKEDEPEND, makedepend)