diff --git a/srcpkgs/tcl/patches/tcl-stat64.patch b/srcpkgs/tcl/patches/tcl-stat64.patch
deleted file mode 100644
index b0133ec40cb..00000000000
--- a/srcpkgs/tcl/patches/tcl-stat64.patch
+++ /dev/null
@@ -1,11 +0,0 @@
---- a/generic/tcl.h
-+++ b/generic/tcl.h
-@@ -17,6 +17,8 @@
- #ifndef _TCL
- #define _TCL
- 
-+#include <sys/stat.h>
-+
- /*
-  * For C++ compilers, use extern "C"
-  */
diff --git a/srcpkgs/tcl/template b/srcpkgs/tcl/template
index d36663d8b1f..082c8153e86 100644
--- a/srcpkgs/tcl/template
+++ b/srcpkgs/tcl/template
@@ -1,6 +1,6 @@
 # Template file for 'tcl'
 pkgname=tcl
-version=8.6.11
+version=8.6.12
 revision=1
 wrksrc="tcl${version}"
 build_wrksrc=unix
@@ -15,12 +15,17 @@ maintainer="Orphaned <orphan@voidlinux.org>"
 license="TCL"
 homepage="http://www.tcl.tk"
 distfiles="${SOURCEFORGE_SITE}/${pkgname}/${pkgname}${version}-src.tar.gz"
-checksum=8c0486668586672c5693d7d95817cb05a18c5ecca2f40e2836b9578064088258
+checksum=26c995dd0f167e48b11961d891ee555f680c175f7173ff8cb829f4ebcde4c1a6
 
 shlib_provides="libtcl${version%.*}.so"
 
 post_extract() {
-	sed -i 's/-DSQLITE_API=MODULE_SCOPE//g' pkgs/sqlite*/Makefile.in
+	vsed -i pkgs/sqlite*/Makefile.in -e 's/-DSQLITE_API=MODULE_SCOPE//g'
+}
+
+do_check() {
+	# thread-4.5 and thread-5* are skipped because they test UB
+	make test TESTFLAGS="-skip 'thread-4.5 thread-5*'"
 }
 
 do_install() {