Building the original bristol-0.60.11 sources on Ubuntu 18.04 fails due to 'alsa/iatomic.h' not found. It's being included in 'libbristolaudio/audioEngineJack.c'. Below is the error log.
make
...
gcc -DHAVE_CONFIG_H -I. -I.. -I/usr/X11R6/include -pthread -Wall -g -I./../include/slab -I./../include/bristol -DBRISTOL_HAS_OSS=1 -D_BRISTOL_DRAIN -DBRISTOL_HAS_ALSA=1 -D_BRISTOL_JACK -D_BRISTOL_JACK_MIDI -D_BRISTOL_JACK_SESSION -I/usr/include/alsa -g -O2 -I/usr/X11R6/include -MT audioEngineJack.o -MD -MP -MF .deps/audioEngineJack.Tpo -c -o audioEngineJack.o audioEngineJack.c
audioEngineJack.c:42:10: fatal error: alsa/iatomic.h: No such file or directory
#include <alsa/iatomic.h>
^~~~~~~~~~~~~~~~
compilation terminated.
Makefile:323: recipe for target 'audioEngineJack.o' failed
make[2]: *** [audioEngineJack.o] Error 1
make[2]: Leaving directory '/home/developer/work/bristol-develop/libbristolaudio'
Makefile:366: recipe for target 'all-recursive' failed
make[1]: *** [all-recursive] Error 1
make[1]: Leaving directory '/home/developer/work/bristol-develop'
Makefile:297: recipe for target 'all' failed
make: *** [all] Error 2