I'm seeing the following when attempting to make rdesktop 1.4:
 
        gcc -g -O2 -Wall -I/opt/freeware/include  -DPACKAGE_NAME=\"rdesktop\" -DPACKAGE_TARNAME=\"rdesktop\" -DPACKAGE_VERSION=\"1.4.0\" -DPACKAGE_STRING=\"rdesktop\ 1.4.0\" -DPACKAGE_BUGREPORT=\"\" -DSTDC_HEADERS=1 -DB_ENDIAN=1 -DHAVE_SYS_TYPES_H=1 -DHAVE_SYS_STAT_H=1 -DHAVE_STDLIB_H=1 -DHAVE_STRING_H=1 -DHAVE_MEMORY_H=1 -DHAVE_STRINGS_H=1 -DHAVE_INTTYPES_H=1 -DHAVE_STDINT_H=1 -DHAVE_UNISTD_H=1 -DHAVE_SYS_SELECT_H=1 -Dssldir=\"/opt/freeware\" -DEGD_SOCKET=\"/var/run/egd-pool\" -DHAVE_DIRENT_H=1 -DHAVE_DECL_DIRFD=0 -DDIR_FD_MEMBER_NAME=dd_fd -DWITH_DEBUG=1  -DKEYMAP_PATH=\"/usr/share/rdesktop/keymaps/\" -o disk.o -c disk.c
disk.c: In function `disk_query_volume_information':
disk.c:1036: error: structure has no member named `f_namelen'
disk.c:1036: error: structure has no member named `f_namelen'
disk.c:1036: error: structure has no member named `f_namelen'
disk.c:1036: error: structure has no member named `f_namelen'
make: 1254-004 The error code from the last command is 1.
This is on AIX 5.3.1.
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