gnu: Add tclxml.

* gnu/packages/patches/tclxml-3.2-install.patch: New file.
* gnu-system.am (dist_patch_DATA): Add it.
* gnu/packages/tcl.scm (tclxml): New variable.

Signed-off-by: Leo Famulari <leo@famulari.name>

gnu-system.am

@@ -707,6 +707,7 @@ dist_patch_DATA =						\
   gnu/packages/patches/tar-d_ino_in_dirent-fix.patch		\
   gnu/packages/patches/tar-skip-unreliable-tests.patch		\
   gnu/packages/patches/tcl-mkindex-deterministic.patch		\
+  gnu/packages/patches/tclxml-3.2-install.patch			\
   gnu/packages/patches/tcsh-fix-autotest.patch			\
   gnu/packages/patches/texi2html-document-encoding.patch	\
   gnu/packages/patches/texi2html-i18n.patch			\

gnu/packages/patches/tclxml-3.2-install.patch

@@ -0,0 +1,17 @@
+Install everything in PREFIX, set EXTRA_PATH to find it there.
+
+--- ./Makefile.in~	2016-02-06 01:29:16.595090365 +0100
++++ ./Makefile.in	2016-02-06 09:29:04.286008931 +0100
+@@ -133,9 +133,9 @@
+ # require for testing here (like TCLX_LIBRARY).
+ #========================================================================
+
+-EXTRA_PATH	= $(top_builddir):$(TCL_BIN_DIR)
++EXTRA_PATH	= $(top_builddir):$(TCL_BIN_DIR):$(libdir)
+ #EXTRA_PATH     = $(top_builddir):$(TCL_BIN_DIR):$(TK_BIN_DIR)
+-TCLLIBPATH      = $(top_builddir)
++TCLLIBPATH      = $(pkglibdir)
+ TCLSH_ENV	= TCL_LIBRARY=`@CYGPATH@ $(TCL_SRC_DIR)/library` \
+ 		  @LD_LIBRARY_PATH_VAR@="$(EXTRA_PATH):$(@LD_LIBRARY_PATH_VAR@)" \
+ 		  PATH="$(EXTRA_PATH):$(PATH)" \
+ 

gnu/packages/tcl.scm

@@ -30,6 +30,7 @@
   #:use-module (gnu packages fontutils)
   #:use-module (gnu packages perl)
   #:use-module (gnu packages pkg-config)
+  #:use-module (gnu packages xml)
   #:use-module (gnu packages xorg)
   #:use-module (guix licenses))
 
@@ -244,3 +245,48 @@ interfaces (GUIs) in the Tcl language.")
     (description "Tcllib, the standard Tcl library, is a collection of common
 utility functions and modules all written in high-level Tcl.")
     (license (package-license tcl))))
+
+(define-public tclxml
+  (package
+    (name "tclxml")
+    (version "3.2")
+    (source (origin
+              (method url-fetch)
+              (uri (string-append "mirror://sourceforge/" name "/"
+                                  name "-" version ".tar.gz"))
+              (sha256
+               (base32
+                "0ffb4aw63inig3aql33g4pk0kjk14dv238anp1scwjdjh1k6n4gl"))
+              (patches (list (search-patch "tclxml-3.2-install.patch")))))
+    (build-system gnu-build-system)
+    (native-inputs
+     `(("tcl" ,tcl)
+       ("tcllib" ,tcllib)
+       ("libxml2" ,libxml2)
+       ("libxslt" ,libxslt)))
+    (native-search-paths
+     (list (search-path-specification
+            (variable "TCLLIBPATH")
+            (separator " ")
+            (files (list (string-append "lib/Tclxml" version))))))
+    (arguments
+     `(#:configure-flags
+       (list (string-append "--exec-prefix=" (assoc-ref %outputs "out"))
+             (string-append "--with-tclconfig="
+                            (assoc-ref %build-inputs "tcl") "/lib")
+             (string-append "--with-xml2-config="
+                            (assoc-ref %build-inputs "libxml2")
+                            "/bin/xml2-config")
+             (string-append "--with-xslt-config="
+                            (assoc-ref %build-inputs "libxslt")
+                            "/bin/xslt-config"))
+       #:test-target "test"))
+    (home-page "http://tclxml.sourceforge.net/")
+    (synopsis "Tcl library for XML parsing")
+    (description "TclXML provides event-based parsing of XML documents.  The
+application may register callback scripts for certain document features, and
+when the parser encounters those features while parsing the document the
+callback is evaluated.")
+    (license (non-copyleft
+              "file://LICENCE"
+              "See LICENCE in the distribution."))))