Can't compile a contrib util: dbsize (probably simply though)

Hello pgsql-general,

  When I am running "make" I get the following:

> gcc -O2 -fno-strict-aliasing -Wall -Wmissing-prototypes -Wmissing-declarations -fpic -I.
-I~/postgresql-7.4.2/src/include-D_GNU_SOURCE   -c -o dbsize.o dbsize.c 
> dbsize.c:1: postgres.h: No such file or directory
> dbsize.c:7: access/heapam.h: No such file or directory
> dbsize.c:8: catalog/catalog.h: No such file or directory
> dbsize.c:9: catalog/namespace.h: No such file or directory
> dbsize.c:10: commands/dbcommands.h: No such file or directory
> dbsize.c:11: fmgr.h: No such file or directory
> dbsize.c:12: storage/fd.h: No such file or directory
> dbsize.c:13: utils/builtins.h: No such file or directory
> make: *** [dbsize.o] Error 1

I don't understand why it can't find these files.. They are indeed in
"~/postgresql-7.4.2/src/include" just as the -I points =(.

Tips will be much appreciated.

Regards,
 Vitaly Belman

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