diff --git a/aclocal.m4 b/aclocal.m4
index 7ab3588b..00d434ee 100644
--- a/aclocal.m4
+++ b/aclocal.m4
@@ -148,7 +148,7 @@ $$1_PKG_ERRORS
 Consider adjusting the PKG_CONFIG_PATH environment variable if you
 installed software in a non-standard prefix.
 
-_PKG_TEXT])dnl
+_PKG_TEXT])[]dnl
         ])
 elif test $pkg_failed = untried; then
      	AC_MSG_RESULT([no])
@@ -159,7 +159,7 @@ path to pkg-config.
 
 _PKG_TEXT
 
-To get pkg-config, see <http://pkg-config.freedesktop.org/>.])dnl
+To get pkg-config, see <http://pkg-config.freedesktop.org/>.])[]dnl
         ])
 else
 	$1[]_CFLAGS=$pkg_cv_[]$1[]_CFLAGS
diff --git a/configure b/configure
index d1dbf5e7..8eaae55b 100755
--- a/configure
+++ b/configure
@@ -3971,7 +3971,7 @@ else
 fi
 
 	if test x"$TCL_TEST" = "xno"; then
-		as_fn_error $? "tcl not found, try --disable-tcl, or install tcl properly." "$LINENO" 5
+		as_fn_error $? "tcl not found, try --disable-tcl, or install tcl properly. If tcl is installed to a non-standard path, use --enable-tcl --with-tcl=/path" "$LINENO" 5
 	fi
 	LDFLAGS="$my_saved_LDFLAGS"
 fi
diff --git a/configure.in b/configure.in
index fb11a02e..0d670aa2 100644
--- a/configure.in
+++ b/configure.in
@@ -365,7 +365,7 @@ then
 	appendLD "$TCL_FLAGS"
 	AC_CHECK_FUNC([Tcl_CreateInterp], [TCL_TEST=yes], [TCL_TEST=no])
 	if test x"$TCL_TEST" = "xno"; then
-		AC_MSG_ERROR([tcl not found, try --disable-tcl, or install tcl properly.])
+		AC_MSG_ERROR([tcl not found, try --disable-tcl, or install tcl properly. If tcl is installed to a non-standard path, use --enable-tcl --with-tcl=/path])
 	fi
 	LDFLAGS="$my_saved_LDFLAGS"
 fi