Build of mcstrans-0.1.3-1 fails in mock:

+ make 'CFLAGS=-g -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions
-fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic'
make -C src 
make[1]: Entering directory `/builddir/build/BUILD/mcstrans-0.1.3/src'
cc -g -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic -I../include -D_GNU_SOURCE
-D_FILE_OFFSET_BITS=64 -c -o mcstrans.o mcstrans.c
cc -g -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector
--param=ssp-buffer-size=4 -m64 -mtune=generic -I../include -D_GNU_SOURCE
-D_FILE_OFFSET_BITS=64 -c -o mcstransd.o mcstransd.c
mcstransd.c:18:28: error: sys/capability.h: No such file or directory
mcstransd.c: In function 'service_request':
mcstransd.c:235: warning: format '%d' expects type 'int', but argument 4 has
type 'ssize_t'
mcstransd.c:235: warning: format '%d' expects type 'int', but argument 5 has
type 'ssize_t'
mcstransd.c:242: warning: format '%d' expects type 'int', but argument 4 has
type 'ssize_t'
mcstransd.c:248: warning: format '%d' expects type 'int', but argument 4 has
type 'ssize_t'
mcstransd.c: In function 'dropprivs':
mcstransd.c:538: error: 'cap_t' undeclared (first use in this function)
mcstransd.c:538: error: (Each undeclared identifier is reported only once
mcstransd.c:538: error: for each function it appears in.)
mcstransd.c:538: error: expected ';' before 'new_caps'
mcstransd.c:540: error: 'new_caps' undeclared (first use in this function)
mcstransd.c:540: warning: implicit declaration of function 'cap_init'
mcstransd.c:542: warning: implicit declaration of function 'cap_set_proc'
mcstransd.c:546: warning: implicit declaration of function 'cap_free'
make[1]: *** [mcstransd.o] Error 1
make[1]: Leaving directory `/builddir/build/BUILD/mcstrans-0.1.3/src'
make: *** [all] Error 2
error: Bad exit status from /var/tmp/rpm-tmp.24126 (%build)

Attached is a patch, adding the required BuildRequires line.