[Bug 228673] [PATCH] graphics/mesa-dri - configure script fails with BSD grep

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228673

            Bug ID: 228673
           Summary: [PATCH] graphics/mesa-dri - configure script fails
                    with BSD grep
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: se at FreeBSD.org
          Assignee: x11 at FreeBSD.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)

Created attachment 193910
  --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=193910&action=edit
Patch that replaces GNU grep specific pattern with generic egrep pattern.

The configure script uses a non-standard syntax not supported by the BSD grep
in -CURRENT. This is easily fixed by use of grep -E or egrep (see attached
patch, which makes configure work with ancient and current GNU grep and BSD
grep).

The problematic command is:

echo $platforms | grep -q "x11\|drm"

The standard compliant form that does not depend on GNU grep is:

echo $platforms | egrep -q "x11|drm"

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