libdwfl: Support automatic decompression of files in XZ format.
diff --git a/m4/zip.m4 b/m4/zip.m4
index 19fa492..8e4d545 100644
--- a/m4/zip.m4
+++ b/m4/zip.m4
@@ -1,18 +1,18 @@
 dnl -*- Autoconf -*- test for either zlib or bzlib.
-dnl Defines --with-$1lib argument, $2LIB automake conditional,
-dnl and sets AC_DEFINE(USE_$2LIB) and LIBS.
+dnl Defines --with-$1 argument, $2 automake conditional,
+dnl and sets AC_DEFINE(USE_$2) and LIBS.
 
 AC_DEFUN([eu_ZIPLIB], [dnl
-AC_ARG_WITH([[$1]lib],
-AC_HELP_STRING([--with-[$1]lib], [support g[$1]ip compression in libdwfl]),,
-	    [with_[$1]lib=default])
-if test $with_[$1]lib != no; then
-  AC_SEARCH_LIBS([$4], [$3], [with_[$1]lib=yes],
-  	         [test $with_[$1]lib = default ||
-		  AC_MSG_ERROR([missing -l[$3] for --with-[$1]lib])])
+AC_ARG_WITH([[$1]],
+AC_HELP_STRING([--with-[$1]], [support [$1] compression in libdwfl]),,
+	    [with_[$1]=default])
+if test $with_[$1] != no; then
+  AC_SEARCH_LIBS([$4], [$3], [with_[$1]=yes],
+  	         [test $with_[$1] = default ||
+		  AC_MSG_ERROR([missing -l[$3] for --with-[$1]])])
 fi
-AM_CONDITIONAL([$2]LIB, test $with_[$1]lib = yes)
-if test $with_[$1]lib = yes; then
-  AC_DEFINE(USE_[$2]LIB)
+AM_CONDITIONAL([$2], test $with_[$1] = yes)
+if test $with_[$1] = yes; then
+  AC_DEFINE(USE_[$2])
 fi
-AH_TEMPLATE(USE_[$2]LIB, [Support $5 decompression via -l$3.])])
+AH_TEMPLATE(USE_[$2], [Support $5 decompression via -l$3.])])