diff -uprN orig/configure.ac new/configure.ac
--- orig/configure.ac	2021-02-02 10:26:24.000000000 +0200
+++ new/configure.ac	2021-02-10 16:20:17.078630690 +0200
@@ -1442,7 +1442,7 @@ AC_ARG_WITH(gssapi,
   fi
 ])
 
-: ${KRB5CONFIG:="$GSSAPI_ROOT/bin/krb5-config"}
+KRB5CONFIG=`which pkg-config`
 
 save_CPPFLAGS="$CPPFLAGS"
 AC_MSG_CHECKING([if GSS-API support is requested])
@@ -1453,7 +1453,7 @@ if test x"$want_gss" = xyes; then
      if test -n "$host_alias" -a -f "$GSSAPI_ROOT/bin/$host_alias-krb5-config"; then
         GSSAPI_INCS=`$GSSAPI_ROOT/bin/$host_alias-krb5-config --cflags gssapi`
      elif test -f "$KRB5CONFIG"; then
-        GSSAPI_INCS=`$KRB5CONFIG --cflags gssapi`
+        GSSAPI_INCS=`$KRB5CONFIG --cflags mit-krb5-gssapi`
      elif test "$GSSAPI_ROOT" != "yes"; then
         GSSAPI_INCS="-I$GSSAPI_ROOT/include"
      fi
@@ -1546,7 +1546,7 @@ if test x"$want_gss" = xyes; then
         elif test -f "$KRB5CONFIG"; then
            dnl krb5-config doesn't have --libs-only-L or similar, put everything
            dnl into LIBS
-           gss_libs=`$KRB5CONFIG --libs gssapi`
+           gss_libs=`$KRB5CONFIG --libs mit-krb5-gssapi`
            LIBS="$gss_libs $LIBS"
         else
            case $host in