add conditional for --enable-man, default is yes

configure.ac

@@ -167,6 +167,13 @@ AC_ARG_ENABLE([zmq],
 
 AC_ARG_WITH([protoc-bindir],[AS_HELP_STRING([--with-protoc-bindir=BIN_DIR],[specify protoc bin path])], [protoc_bin_path=$withval], [])
 
+# Enable manpages
+AC_ARG_ENABLE(man,
+    [AS_HELP_STRING([--enable-man],
+                    [install man pages [default=yes]])],,
+    enable_man=yes)
+AM_CONDITIONAL(ENABLE_MAN, test "$enable_man" != no)
+
 # Enable debug
 AC_ARG_ENABLE([debug],
     [AS_HELP_STRING([--enable-debug],
@@ -1046,7 +1053,7 @@ AC_SUBST(EVENT_PTHREADS_LIBS)
 AC_SUBST(ZMQ_LIBS)
 AC_SUBST(PROTOBUF_LIBS)
 AC_SUBST(QR_LIBS)
-AC_CONFIG_FILES([Makefile src/Makefile share/setup.nsi share/qt/Info.plist src/test/buildenv.py])
+AC_CONFIG_FILES([Makefile src/Makefile doc/man/Makefile share/setup.nsi share/qt/Info.plist src/test/buildenv.py])
 AC_CONFIG_FILES([qa/pull-tester/run-bitcoind-for-test.sh],[chmod +x qa/pull-tester/run-bitcoind-for-test.sh])
 AC_CONFIG_FILES([qa/pull-tester/tests_config.py],[chmod +x qa/pull-tester/tests_config.py])
 AC_CONFIG_FILES([contrib/devtools/split-debug.sh],[chmod +x contrib/devtools/split-debug.sh])