Compiling on 11.1-RELEASE-p6 amd64 fails:

/usr/local/libexec/ccache/world/c++ -DHAVE_CONFIG_H -I.  -DBUILD_INFO='"(local build)"' -DSMARTMONTOOLS_SYSCONFDIR='"/usr/local/etc"' -DSMARTMONTOOLS_SMARTDSCRIPTDIR='"/usr/local/etc"' -DSMARTMONTOOLS_DRIVEDBDIR='"/usr/local/share/smartmontools"'        -O2 -pipe -fstack-protector -fno-strict-aliasing  -Wall -W -c -o smartd.o smartd.cpp
/bin/sh ./config.status --file=update-smart-drivedb
config.status: creating update-smart-drivedb
/bin/sh ./config.status --file=smartd_warning.sh
chmod +x update-smart-drivedb
 $(MAN_FILTER) < ./smartd.conf.5.in > smartd.conf.5
 $(MAN_FILTER) < ./smartctl.8.in > smartctl.8
 $(MAN_FILTER) < ./smartd.8.in > smartd.8
config.status: creating smartd_warning.sh
 $(MAN_FILTER) < ./update-smart-drivedb.8.in > update-smart-drivedb.8
sed 's|/usr/local/sbin/|/usr/local/sbin/|g' ./smartd.freebsd.initd.in > smartd.freebsd.initd
chmod +x smartd_warning.sh
/usr/local/libexec/ccache/world/c++ -DHAVE_CONFIG_H -I.  -DBUILD_INFO='"(local build)"' -DSMARTMONTOOLS_SYSCONFDIR='"/usr/local/etc"' -DSMARTMONTOOLS_SMARTDSCRIPTDIR='"/usr/local/etc"' -DSMARTMONTOOLS_DRIVEDBDIR='"/usr/local/share/smartmontools"'        -O2 -pipe -fstack-protector -fno-strict-aliasing  -Wall -W -c -o utility.o utility.cpp
In file included from os_freebsd.cpp:43:
./atacmds.h:96:9: warning: 'ATA_WRITE_LOG_EXT' macro redefined [-Wmacro-redefined]
#define ATA_WRITE_LOG_EXT               0x3F
        ^
/usr/include/sys/ata.h:385:9: note: previous definition is here
#define ATA_WRITE_LOG_EXT               0x3f
        ^
os_freebsd.cpp:63:10: fatal error: 'libusb20_desc.h' file not found
#include <libusb20_desc.h>
         ^~~~~~~~~~~~~~~~~
1 warning and 1 error generated.
gmake[3]: *** [Makefile:1235: os_freebsd.o] Error 1