Flex needs m4 to run (see below) and, since the create_wrapper
introduces a bash dependency, export the right m4 path when /etc/profile
is sourced by the shell.

Snippet from the flex documentation:
"The macro processor m4 must be installed wherever flex is installed.
<...>
m4 is only required at the time you run flex."

[YOCTO #5329]

Signed-off-by: Laurentiu Palcu <laurentiu.pa...@intel.com>
---
 meta/recipes-devtools/flex/flex.inc |    7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/meta/recipes-devtools/flex/flex.inc 
b/meta/recipes-devtools/flex/flex.inc
index 43f1dda..eed2908 100644
--- a/meta/recipes-devtools/flex/flex.inc
+++ b/meta/recipes-devtools/flex/flex.inc
@@ -13,6 +13,11 @@ inherit autotools gettext
 M4 = "${bindir}/m4"
 M4_class-native = "${STAGING_BINDIR_NATIVE}/m4"
 
+do_install_append_class-target() {
+       install -d ${D}${sysconfdir}/profile.d
+       echo "export M4=${M4}" > ${D}${sysconfdir}/profile.d/flex.sh
+}
+
 do_install_append_class-native() {
        create_wrapper ${D}/${bindir}/flex M4=${M4}
 }
@@ -20,3 +25,5 @@ do_install_append_class-native() {
 do_install_append_class-nativesdk() {
        create_wrapper ${D}/${bindir}/flex M4=${M4}
 }
+
+RDEPENDS_${PN} += "m4"
-- 
1.7.9.5

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