[Buildroot] [Bug 11576] Unable to start apache with event MPM on raspberry pi 3

[bugzilla at busybox.net <bugzilla@busybox.net>]

https://bugs.busybox.net/show_bug.cgi?id=11576

--- Comment #1 from Peter Seiderer <ps.report@gmx.net> ---
Apache is based on apr and apr has some configure runtime checks for some
features, e.g. epoll, failing for the cross compile.

Quick test with the following (buildroot) patch enables successful apache
startup again:

diff --git a/package/apr/apr.mk b/package/apr/apr.mk
index 58b1d86b28..8f29e57c59 100644
--- a/package/apr/apr.mk
+++ b/package/apr/apr.mk
@@ -26,7 +26,12 @@ APR_CONF_ENV = \
        ac_cv_sizeof_pid_t=4 \
        ac_cv_struct_rlimit=yes \
        ac_cv_o_nonblock_inherited=no \
-       apr_cv_mutex_recursive=yes
+       apr_cv_mutex_recursive=yes \
+       apr_cv_epoll=yes \
+       apr_cv_epoll_create1=yes \
+       apr_cv_dup3=yes \
+       apr_cv_sock_cloexec=yes \
+       apr_cv_accept4=yes
 APR_CONFIG_SCRIPTS = apr-1-config

 # Doesn't even try to guess when cross compiling

Tested with raspberrypi3_qt5we_defconfig and the following two
additional config options:

BR2_PACKAGE_APACHE=y
BR2_PACKAGE_APACHE_MPM_EVENT=y

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