This patch was created inhouse and is not applicable for submitting to
upstream. This is because it implements Solaris oddity - having the binaries
available both without prefix and with 'g' prefix at the same time, only in
different paths.

--- grep-2.20/src/egrep.sh	2015-06-29 16:48:08.536062429 +0200
+++ grep-2.20/src/egrep.sh	2015-06-29 16:47:57.380731794 +0200
@@ -1,11 +1,29 @@
 #!@SHELL@
-grep=grep
-case $0 in
+# The script is a wrapper to GNU grep to be called with apropriate (-E or -F)
+# command line option. We can't just run 'ggrep' as the path may not contain
+# '/usr/bin' and we can't just use 'grep' as the PATH may not contain
+# '/usr/gnu/bin'. Also we can't just use fixed path as /usr/gnu/bin/grep because
+# this script must work even from workspace before being installed into /usr/...
+# testing the binaries from the workspace.
+
+if [[ "$( /usr/bin/basename "$0" )" == g* ]]; then
+  # gfgrep or gegrep (potentially in /usr/bin)
+  grep=ggrep
+else
+  # fgrep or egrep in (potentially in /usr/gnu/bin)
+  grep=grep
+fi
+
+case "$0" in
   */*)
-    dir=${0%/*}
-    if test -x "$dir/@grep@"; then
-      PATH=$dir:$PATH
-      grep=@grep@
-    fi;;
+    dir="${0%/*}"
+    if test -x "$dir/$grep"; then
+      PATH="$dir:$PATH"
+    fi
+    ;;
+  *)
+    PATH="@prefix@/bin:$PATH"
+    ;;
 esac
-exec $grep @option@ "$@"
+
+exec "$grep" @option@ "$@"