diff --git a/tcsh-6.18.03-colorls.dif b/tcsh-6.18.03-colorls.dif
index 00a6785..92671b7 100644
--- a/tcsh-6.18.03-colorls.dif
+++ b/tcsh-6.18.03-colorls.dif
@@ -1,9 +1,76 @@
 ---
- tw.color.c |   10 ++++------
- 1 file changed, 4 insertions(+), 6 deletions(-)
+ tests/ls-F.at |   36 ++++++++++++++++++------------------
+ tw.color.c    |   10 ++++------
+ 2 files changed, 22 insertions(+), 24 deletions(-)
 
+--- tests/ls-F.at
++++ tests/ls-F.at	2023-04-13 12:51:33.133052023 +0000
+@@ -358,9 +358,9 @@ dnl
+ dnl Fail: environment LS_COLORS=YY:XX=0 exits with unknown 'XX'.
+ dnl (Unknown 'YY' is ignored.)
+ dnl
+-AT_CHECK([LS_COLORS=YY:XX=0 tcsh -f -c 'set color;cd DIR && ls-F'], [1], [], [dnl
+-Unknown LS_COLORS color variable 'XX'.
+-])
++dnl AT_CHECK([LS_COLORS=YY:XX=0 tcsh -f -c 'set color;cd DIR && ls-F'], [1], [], [dnl
++dnl Unknown LS_COLORS color variable 'XX'.
++dnl ])
+ 
+ dnl
+ dnl setenv LS_COLORS "YY:XX=0" warns for unknown 'XX='. (Unknown 'YY' is ignored').
+@@ -368,11 +368,11 @@ dnl listflags=A, listlinks
+ dnl
+ dnl As per ls-F-color-default.out.
+ dnl
+-TCSH_LS_F([${tests_dir}/ls-F-color-default.out],
+-    [],
+-    [setenv LS_COLORS "YY:XX=0"; set color listflags=A listlinks], [dnl
+-Unknown LS_COLORS color variable 'XX'.
+-])
++dnl TCSH_LS_F([${tests_dir}/ls-F-color-default.out],
++dnl     [],
++dnl     [setenv LS_COLORS "YY:XX=0"; set color listflags=A listlinks], [dnl
++dnl Unknown LS_COLORS color variable 'XX'.
++dnl ])
+ 
+ dnl
+ dnl Check setenv LS_COLORS that all variables before an unknown variable are used.
+@@ -383,11 +383,11 @@ dnl listflags=A, listlinks
+ dnl
+ dnl As per ls-F-LS_COLORS-all.out.
+ dnl
+-TCSH_LS_F([${tests_dir}/ls-F-LS_COLORS-all.out],
+-    [],
+-    [setenv LS_COLORS "TCSH_TEXT_LS_COLORS:YY:XX=0"; set color listflags=A listlinks], [dnl
+-Unknown LS_COLORS color variable 'XX'.
+-])
++dnl TCSH_LS_F([${tests_dir}/ls-F-LS_COLORS-all.out],
++dnl     [],
++dnl     [setenv LS_COLORS "TCSH_TEXT_LS_COLORS:YY:XX=0"; set color listflags=A listlinks], [dnl
++dnl Unknown LS_COLORS color variable 'XX'.
++dnl ])
+ 
+ dnl
+ dnl LS_COLORS as TCSH_TEXT_LS_COLORS, override with setenv LSCOLORS,
+@@ -407,11 +407,11 @@ dnl override with LSCOLORS=Aa,
+ dnl then unsetenv LSCOLORS to reapply faulty LS_COLORS without warning.
+ dnl and results in default colors.
+ dnl
+-TCSH_LS_F([${tests_dir}/ls-F-color-default.out],
+-    [],
+-    [setenv LS_COLORS XX=0; setenv LSCOLORS Aa; unsetenv LSCOLORS || echo FAIL; set color listflags=A listlinks], [dnl
+-Unknown LS_COLORS color variable 'XX'.
+-])
++dnl TCSH_LS_F([${tests_dir}/ls-F-color-default.out],
++dnl     [],
++dnl     [setenv LS_COLORS XX=0; setenv LSCOLORS Aa; unsetenv LSCOLORS || echo FAIL; set color listflags=A listlinks], [dnl
++dnl Unknown LS_COLORS color variable 'XX'.
++dnl ])
+ 
+ m4_popdef([TCSH_TEXT_LS_COLORS])
+ 
 --- tw.color.c
-+++ tw.color.c	2023-04-13 12:32:43.646160772 +0000
++++ tw.color.c	2023-04-13 12:33:48.052952714 +0000
 @@ -56,7 +56,7 @@ typedef struct {
  typedef enum {
      Vdi, Vln, Vor, Vpi, Vso, Vdo, Vbd, Vcd,
diff --git a/tcsh.changes b/tcsh.changes
index d21bd03..0f063f4 100644
--- a/tcsh.changes
+++ b/tcsh.changes
@@ -6,6 +6,8 @@ Thu Apr 13 12:34:15 UTC 2023 - Dr. Werner Fink <werner@suse.de>
   * Don't crash if LSCOLORS contains > 11 pairs (Luke Mewburn)
 - Port patch
   * tcsh-6.18.03-colorls.dif
+    that is we ignore unknown colors to be compatible with LS_COLOR
+    used by /usr/bin/ls from coreutils
 
 -------------------------------------------------------------------
 Tue Apr 11 09:52:13 UTC 2023 - Dr. Werner Fink <werner@suse.de>