gentoo-overlay/dev-tcltk/blt/files/blt-2.5.3-gbsd.patch

--- a/configure.in	2012-05-06 18:11:47.000000000 -0400
+++ b/configure.in	2012-05-06 18:15:08.000000000 -0400
@@ -708,7 +708,7 @@
 fi
 
 case $target in
-  *-sunos4*|*-*-netbsd|NetBSD-*|FreeBSD-*|OpenBSD-*|*-*-cygwin*|*-*-mingw*)
+  *-sunos4*|*-*-netbsd|NetBSD-*|FreeBSD-*|*-*-freebsd*|OpenBSD-*|*-*-cygwin*|*-*-mingw*)
     TCL_LIB_NAME="tcl${TCL_MAJOR_VERSION}${TCL_MINOR_VERSION}"
     TK_LIB_NAME="tk${TK_MAJOR_VERSION}${TK_MINOR_VERSION}"
     ;;
@@ -1241,6 +1241,12 @@
     EXTRA_LIB_SPECS="-ldl"
     ;;
 
+  *-gentoo-netbsd*|*-gentoo-freebsd*|*-gentoo-openbsd*)
+    SHLIB_CFLAGS="-fPIC"
+    SHLIB_LD="${CC}"
+    SHLIB_LD_FLAGS='-rdynamic -shared -Wl,-E -Wl,-soname,$@'
+    ;;
+
   *-netbsd*|*-freebsd*|*-openbsd*)
     # Not available on all versions:  check for include file.
     AC_CHECK_HEADER(dlfcn.h, test_ok=yes, test_ok=no)