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: Wed, 21 Mar 2018 10:53:10 +0300

--- a/library/Makefile.in
+++ b/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
 
--- a/library/pkgIndex.tcl.in
+++ b/library/pkgIndex.tcl.in
@@ -7,23 +7,11 @@
     regsub {\.} $version {} version_no_dots
     set versuf $version$suffix
 
+    set taillib ${versuf}.[info tclversion]
+
     # Determine whether to load the full BLT library or
     # the "lite" tcl-only version.
     
-   if {[package vcompare [info tclversion] 8.2] < 0} {
-        set taillib ${versuf}.8.0
-    } elseif {[package vcompare [info tclversion] 8.3] < 0} {
-        set taillib ${versuf}.8.2
-    } elseif {[package vcompare [info tclversion] 8.4] < 0} {
-        set taillib ${versuf}.8.3
-    } elseif {[package vcompare [info tclversion] 8.5] < 0} {
-        set taillib ${versuf}.8.4
-    } elseif {[package vcompare [info tclversion] 8.6] < 0} {
-        set taillib ${versuf}.8.5
-    } else {
-        set taillib ${versuf}.8.6
-    }
-
     if { [info commands tk] == "tk" } {
         set name1 ${prefix}BLT.${taillib}
         set name2 ${prefix}BLT${version_no_dots}${suffix}
@@ -49,11 +37,13 @@
         }
 	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
--- a/library/init.tcl
+++ b/library/init.tcl
@@ -8,7 +8,9 @@
         }
     }
 
-   initializeLibrary
+    if {[info commands tk] == "tk"} {
+	initializeLibrary
+    }
     
 }
 
--- a/configure.in
+++ b/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)