Description: Patch fixes loading the libBLT library from
    [package require BLT]. Specifically, it provides correct version
    BLT_PATCH_LEVEL and prevents loading the library twice (once
    by its real name and onr more time by a symlink if the blt-dev
    package is installed). Also, it skips initializing widget bindings
    if Tk isn't present.
Author: Sergei Golovan
Author: Steve Langasek <vorlon@debian.org>
Last-Modified: Mon, 31 Aug 2015 12:09:00 -0700

Index: blt-2.5.3+dfsg/library/Makefile.in
===================================================================
--- blt-2.5.3+dfsg.orig/library/Makefile.in
+++ blt-2.5.3+dfsg/library/Makefile.in
@@ -5,6 +5,7 @@
 prefix       = @prefix@
 exec_prefix  = @exec_prefix@
 version      = @BLT_VERSION@
+patchlevel   = @BLT_PATCH_LEVEL@
 lib_prefix    = @BLT_LIB_PREFIX@
 srcdir       = @srcdir@
 libdir       = @libdir@
@@ -49,6 +50,7 @@
 pkgIndex: 
 	rm -f pkgIndex.tcl
 	sed -e 's/%VERSION%/$(version)/' $(srcdir)/pkgIndex.tcl.in | \
+	sed -e 's/%PATCHLEVEL%/$(patchlevel)/' | \
 	sed -e 's/%LIB_PREFIX%/$(lib_prefix)/' | \
 	sed -e 's;%LIB_DIR%;$(libdir);' > pkgIndex.tcl
 
Index: blt-2.5.3+dfsg/library/pkgIndex.tcl.in
===================================================================
--- blt-2.5.3+dfsg.orig/library/pkgIndex.tcl.in
+++ blt-2.5.3+dfsg/library/pkgIndex.tcl.in
@@ -49,11 +49,13 @@
         }
 	if { ![file exists $library] } continue
         load $library BLT
+	break
     }
 }
 
 set version "%VERSION%"
+set patchlevel %PATCHLEVEL%
 
-package ifneeded BLT $version [list LoadBLT25 $version $dir]
+package ifneeded BLT $patchlevel [list LoadBLT25 $version $dir]
 
 # End of package index file
Index: blt-2.5.3+dfsg/library/init.tcl
===================================================================
--- blt-2.5.3+dfsg.orig/library/init.tcl
+++ blt-2.5.3+dfsg/library/init.tcl
@@ -8,7 +8,9 @@
         }
     }
 
-   initializeLibrary
+    if {[info commands tk] == "tk"} {
+	initializeLibrary
+    }
     
 }
 
Index: blt-2.5.3+dfsg/configure.in
===================================================================
--- blt-2.5.3+dfsg.orig/configure.in
+++ blt-2.5.3+dfsg/configure.in
@@ -977,6 +977,13 @@
 
 BLT_VERSION=${BLT_MAJOR_VERSION}.${BLT_MINOR_VERSION}
 
+AC_MSG_CHECKING([BLT_PATCH_LEVEL])
+AC_CACHE_VAL(blt_cv_patch_level,
+AC_GREP_SYMBOL(blt_cv_patch_level, BLT_PATCH_LEVEL, ${srcdir}/generic/blt.h)
+)
+AC_MSG_RESULT([$blt_cv_patch_level])
+BLT_PATCH_LEVEL=${blt_cv_patch_level}
+
 # Add BLT to the run path
 libdir=${exec_prefix}/lib
 
@@ -1386,6 +1393,7 @@
 AC_SUBST(DEFINES)
 AC_SUBST(BLT_MAJOR_VERSION)
 AC_SUBST(BLT_MINOR_VERSION)
+AC_SUBST(BLT_PATCH_LEVEL)
 AC_SUBST(BLT_VERSION)
 AC_SUBST(AUX_LIBS)
 AC_SUBST(TCL_LIB_DIR)