making all mod_mp4
Compiling mp4_helper.cpp...
In file included from mp4_helper.cpp:25:
./mp4_helper.hpp:59:3: error: unknown type name 'u_int32_t'
                u_int32_t frame; // sampleID
                ^
./mp4_helper.hpp:60:3: error: unknown type name 'u_int16_t'
                u_int16_t packetsPerFrame;
                ^
./mp4_helper.hpp:61:3: error: unknown type name 'u_int16_t'
                u_int16_t packet; // packetID
                ^
./mp4_helper.hpp:62:3: error: unknown type name 'u_int32_t'
                u_int32_t last_frame; // timestamp
                ^
./mp4_helper.hpp:75:3: error: unknown type name 'u_int8_t'
                u_int8_t payload;
                ^
./mp4_helper.hpp:76:3: error: unknown type name 'u_int32_t'
                u_int32_t clock;
                ^
./mp4_helper.hpp:77:3: error: unknown type name 'u_int32_t'
                u_int32_t packetLength; // packet Length in time (ms)
                ^
7 errors generated.
make[5]: *** [mp4_helper.o] Error 1
make[4]: *** [all] Error 1
make[3]: *** [mod_mp4-all] Error 1
make[2]: *** [-liconv] Error 2

...and then agin, after building the others, make has final go ...

making all mod_mp4
Compiling mp4_helper.cpp...
In file included from mp4_helper.cpp:25:
./mp4_helper.hpp:59:3: error: unknown type name 'u_int32_t'
                u_int32_t frame; // sampleID
                ^
./mp4_helper.hpp:60:3: error: unknown type name 'u_int16_t'
                u_int16_t packetsPerFrame;
                ^
./mp4_helper.hpp:61:3: error: unknown type name 'u_int16_t'
                u_int16_t packet; // packetID
                ^
./mp4_helper.hpp:62:3: error: unknown type name 'u_int32_t'
                u_int32_t last_frame; // timestamp
                ^
./mp4_helper.hpp:75:3: error: unknown type name 'u_int8_t'
                u_int8_t payload;
                ^
./mp4_helper.hpp:76:3: error: unknown type name 'u_int32_t'
                u_int32_t clock;
                ^
./mp4_helper.hpp:77:3: error: unknown type name 'u_int32_t'
                u_int32_t packetLength; // packet Length in time (ms)
                ^
7 errors generated.
make[5]: *** [mp4_helper.o] Error 1
make[4]: *** [all] Error 1
make[3]: *** [mod_mp4-all] Error 1
make[2]: *** [all-recursive] Error 1
make[1]: *** [all-recursive] Error 1
make: *** [all] Error 2

-------------------------------------
add, in place of line 28 of src/mod/applications/mod_mp4/mp4_helper.hpp:
#include <sys/types.h>
-------------------------------------

fS now builds fine (well, as fine as it gets on Mav ... reports a warning, but
it's being pendantic)

making all mod_mp4
Compiling mp4_helper.cpp...
Compiling /usr/local/src/freeswitch/src/mod/applications/mod_mp4/mod_mp4.cpp...
quiet_libtool: compile:  g++ -I/usr/local/src/freeswitch/libs/curl/include -I/usr/local/src/freeswitch/src/include -I/usr/local/src/freeswitch/src/include -I/usr/local/src/freeswitch/libs/libteletone/src -I/usr/local/src/freeswitch/libs/stfu -g -O2 -D_GNU_SOURCE -DHAVE_CONFIG_H -c /usr/local/src/freeswitch/src/mod/applications/mod_mp4/mod_mp4.cpp  -fno-common -DPIC -o .libs/mod_mp4.o
/usr/local/src/freeswitch/src/mod/applications/mod_mp4/mod_mp4.cpp:161:1: warning: '/*' within block comment [-Wcomment]
/*
^
1 warning generated.
quiet_libtool: compile:  g++ -I/usr/local/src/freeswitch/libs/curl/include -I/usr/local/src/freeswitch/src/include -I/usr/local/src/freeswitch/src/include -I/usr/local/src/freeswitch/libs/libteletone/src -I/usr/local/src/freeswitch/libs/stfu -g -O2 -D_GNU_SOURCE -DHAVE_CONFIG_H -c /usr/local/src/freeswitch/src/mod/applications/mod_mp4/mod_mp4.cpp -o mod_mp4.o >/dev/null 2>&1
Creating mod_mp4.la...