cross-compiling screen 4.2.1 fails

$ CC="mips-linux-musl-gcc -L/media/3T/mips-prefix//lib 
-I/media/3T/mips-prefix//include" ./configure -C --prefix= 
--host=mips-linux-musl

configure: loading cache config.cache
this is screen version 4.2.1
checking for mips-linux-musl-gcc... mips-linux-musl-gcc 
-L/media/3T/mips-prefix//lib -I/media/3T/mips-prefix//include
checking whether the C compiler works... yes
checking for C compiler default output file name... a.out
checking for suffix of executables...
checking whether we are cross compiling... yes
checking for suffix of object files... (cached) o
checking whether we are using the GNU C compiler... (cached) yes
checking whether mips-linux-musl-gcc -L/media/3T/mips-prefix//lib 
-I/media/3T/mips-prefix//include accepts -g... (cached) yes
checking for mips-linux-musl-gcc -L/media/3T/mips-prefix//lib 
-I/media/3T/mips-prefix//include option to accept ISO C89... (cached) 
none needed
checking how to run the C preprocessor... mips-linux-musl-gcc 
-L/media/3T/mips-prefix//lib -I/media/3T/mips-prefix//include -E
checking for grep that handles long lines and -e... (cached) grep
checking for egrep... (cached) grep -E
checking whether mips-linux-musl-gcc -L/media/3T/mips-prefix//lib 
-I/media/3T/mips-prefix//include needs -traditional... (cached) no
checking for library containing strerror... (cached) none required
checking for ANSI C header files... (cached) yes
checking for sys/types.h... (cached) yes
checking for sys/stat.h... (cached) yes
checking for stdlib.h... (cached) yes
checking for string.h... (cached) yes
checking for memory.h... (cached) yes
checking for strings.h... (cached) yes
checking for inttypes.h... (cached) yes
checking for stdint.h... (cached) yes
checking for unistd.h... (cached) yes
checking for minix/config.h... (cached) no
checking whether it is safe to define __EXTENSIONS__... (cached) yes
configure: error: in `/media/3T/mips-prefix/src/build/screen/screen-4.2.1':
configure: error: cannot run test program while cross compiling
See `config.log' for more details

and config.log says:

configure:3620: checking whether it is safe to define __EXTENSIONS__
configure:3645: result: yes
configure:3661: error: in 
`/media/3T/mips-prefix/src/build/screen/screen-4.2.1':
configure:3663: error: cannot run test program while cross compiling
See `config.log' for more details

the used cross-compiler is from the musl-cross project[0].
(built from tip/master as of june 9, 2014)

it seems that configure was instructed to run some tests that require 
execution of the test binary; those tests should either be rewritten to 
not require execution, or skipped when cross compilation was detected.

regards,
--JS

[0] https://bitbucket.org/GregorR/musl-cross/