2.2.30.2 fails to compile on centos 7

[Matt Bryant]

Just downloaded the latest release 2.2.30.2, ran ./configure with all
defaults and make ...

and it fails to build .. error somewhere whilst running Makefile in lib-http

libtool: link: gcc -std=gnu99 -g -O2 -Wall -W -Wmissing-prototypes
-Wmissing-declarations -Wpointer-arith -Wchar-subscripts -Wformat=2
-Wbad-function-cast -fno-builtin-strftime -Wstrict-aliasing=2
-Wl,--as-needed -o test-http-server-errors test-http-server-errors.o
-Wl,--export-dynamic  ./.libs/libhttp.a ../lib-dns/.libs/libdns.a
../lib-ssl-iostream/.libs/libssl_iostream.a
../lib-master/.libs/libmaster.a ../lib-settings/.libs/libsettings.a
../lib-test/.libs/libtest.a ../lib/.libs/liblib.a -ldl
collect2: error: ld returned 1 exit status
make[3]: *** [test-http-server-errors] Error 1
make[3]: Leaving directory
`/home/rpmbuild/rpmbuild/BUILD/dovecot-2.2.30.2/src/lib-http'
make[2]: *** [all-recursive] Error 1
make[2]: Leaving directory
`/home/rpmbuild/rpmbuild/BUILD/dovecot-2.2.30.2/src'
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory `/home/rpmbuild/rpmbuild/BUILD/dovecot-2.2.30.2'
make: *** [all] Error 2

any ideas ?? 2.2.30.1 built ok ...

rgds

Matt