We can get 1.5 to compile quite nicely on Solaris 11 :) 1.6 has a few nice features though we'd like to have, if it all possible. I have a VMDK created if the developers want to try it themselves in a virtual machine.
Here is the output of the compiler, which is GCC-48: user@tomee:~/haproxy-1.6.5$ gmake TARGET=solaris gcc -Iinclude -Iebtree -Wall -O2 -g -fno-strict-aliasing -Wdeclaration-after-statement -fomit-frame-pointer -DFD_SETSIZE=65536 -D_REENTRANT -DTPROXY -DCONFIG_HAP_CRYPT -DNEED_CRYPT_H -DUSE_GETADDRINFO -DENABLE_POLL -DCONFIG_HAPROXY_VERSION=\"1.6.5\" -DCONFIG_HAPROXY_DATE=\"2016/05/10\" \ -DBUILD_TARGET='"solaris"' \ -DBUILD_ARCH='""' \ -DBUILD_CPU='"generic"' \ -DBUILD_CC='"gcc"' \ -DBUILD_CFLAGS='"-O2 -g -fno-strict-aliasing -Wdeclaration-after-statement -fomit-frame-pointer -DFD_SETSIZE=65536 -D_REENTRANT"' \ -DBUILD_OPTIONS='""' \ -c -o src/haproxy.o src/haproxy.c In file included from include/common/ticks.h:56:0, from include/proto/proxy.h:26, from include/common/cfgparse.h:30, from src/haproxy.c:63: include/common/standard.h:1013:34: error: static declaration of 'htonll' follows non-static declaration static inline unsigned long long htonll(unsigned long long a) ^ In file included from /usr/include/netinet/in.h:73:0, from /usr/include/sys/socket.h:29, from src/haproxy.c:36: /usr/include/sys/byteorder.h:75:17: note: previous declaration of 'htonll' was here extern uint64_t htonll(uint64_t); ^ In file included from include/common/ticks.h:56:0, from include/proto/proxy.h:26, from include/common/cfgparse.h:30, from src/haproxy.c:63: include/common/standard.h:1028:34: error: static declaration of 'ntohll' follows non-static declaration static inline unsigned long long ntohll(unsigned long long a) ^ In file included from /usr/include/netinet/in.h:73:0, from /usr/include/sys/socket.h:29, from src/haproxy.c:36: /usr/include/sys/byteorder.h:76:17: note: previous declaration of 'ntohll' was here extern uint64_t ntohll(uint64_t); ^ gmake: *** [src/haproxy.o] Error 1 user@tomee:~/haproxy-1.6.5$ cheers, -- *Jonathan S. Fisher* Senior Software Engineer https://twitter.com/exabrial http://www.tomitribe.com https://www.tomitribe.io