--- seamonkey-2.46/mozilla/build/autoconf/icu.m4~	2016-12-14 03:09:42.000000000 +0100
+++ seamonkey-2.46/mozilla/build/autoconf/icu.m4	2017-01-31 16:04:37.386019997 +0100
@@ -62,15 +62,8 @@
 
 dnl Settings for the implementation of the ECMAScript Internationalization API
 if test -n "$USE_ICU"; then
-    icudir="$_topsrcdir/intl/icu/source"
-    if test ! -d "$icudir"; then
-        icudir="$_topsrcdir/../../intl/icu/source"
-        if test ! -d "$icudir"; then
-            AC_MSG_ERROR([Cannot find the ICU directory])
-        fi
-    fi
 
-    version=`sed -n 's/^[[[:space:]]]*#[[:space:]]*define[[:space:]][[:space:]]*U_ICU_VERSION_MAJOR_NUM[[:space:]][[:space:]]*\([0-9][0-9]*\)[[:space:]]*$/\1/p' "$icudir/common/unicode/uvernum.h"`
+    version=`sed -n 's/^\s*#\s*define\s\s*U_ICU_VERSION_MAJOR_NUM\s\s*\([0-9][0-9]*\)\s*$/\1/p' "/usr/include/unicode/uvernum.h"`
     if test x"$version" = x; then
        AC_MSG_ERROR([cannot determine icu version number from uvernum.h header file $lineno])
     fi