diff --git a/packages/tcl/build.sh b/packages/tcl/build.sh
index aa0a2a9e3..1c65a2143 100644
--- a/packages/tcl/build.sh
+++ b/packages/tcl/build.sh
@@ -2,10 +2,15 @@ TERMUX_PKG_HOMEPAGE=https://www.tcl.tk/
 TERMUX_PKG_DESCRIPTION="Powerful but easy to learn dynamic programming language"
 _MAJOR_VERSION=8.6
 TERMUX_PKG_VERSION=${_MAJOR_VERSION}.4
-TERMUX_PKG_BUILD_REVISION=1
+TERMUX_PKG_BUILD_REVISION=2
 TERMUX_PKG_SRCURL=http://downloads.sourceforge.net/project/tcl/Tcl/${TERMUX_PKG_VERSION}/tcl${TERMUX_PKG_VERSION}-src.tar.gz
 TERMUX_PKG_FOLDERNAME=tcl$TERMUX_PKG_VERSION
-TERMUX_PKG_EXTRA_CONFIGURE_ARGS="tcl_cv_strtod_buggy=ok --mandir=$TERMUX_PREFIX/share/man --enable-man-symlinks"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS="tcl_cv_strtod_buggy=ok tcl_cv_strstr_unbroken=ok"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_func_strtod=yes tcl_cv_strtod_unbroken=ok"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_func_strtoul=yes tcl_cv_strtoul_unbroken=ok"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" ac_cv_func_memcmp=yes ac_cv_func_memcmp_working=yes"
+TERMUX_PKG_EXTRA_CONFIGURE_ARGS+=" --mandir=$TERMUX_PREFIX/share/man --enable-man-symlinks"
+
 
 termux_step_pre_configure () {
 	TERMUX_PKG_SRCDIR=$TERMUX_PKG_SRCDIR/unix