pg_config: command not found and missing magic block

[zheka-13]

Hi,
When postgresql compiled from source and installed into default dirs pg_config not accessible from PATH. My suggestion below. One can easily change pg_config location in Makefile and there won't be no warnings.
I suggest to modify Makefile:

1. Instead of
   PGXS := $(shell pg_config --pgxs)
   do
   PG_CONFIG = pg_config
   PGXS := $(shell $(PG_CONFIG) --pgxs)
2. Add OBJS = zson.o. I don't understand why it's removed. Without it i can compile extension but get error when try to install it
   incompatible library "/usr/local/pgsql/lib/zson.so": missing magic block

[afiskon]

OK, I can confirm (2). Thanks a lot for reporting this. Fixed in 3d89ce8 CC: @arssher

I can't tell that I fully agree with (1) though. If pg_config is not in PATH it means that psql and other tools are not too. This is very atypical installation to say the least.

[arssher]

2) Sorry, this is my fault: recently I have cleaned the Makefile, but forgot to remove MODULE_big var from it. See the following pull request where it is explained in the detail:
#12

1) I support the idea: the situation in which you use for development several custom-built postgres'es is not rare. However, your solution is not good because it requires manual changes in the Makefile. In my pull request I improved this.