Hi,
https://gcc.gnu.org/onlinedocs/cpp/Include-Syntax.html
#include <file>
This variant is used for system header files. It searches for a file
named file in a standard list of system directories. You can prepend
directories to this list with the -I option (see Invocation).
#include "file"
This variant is used for header files of your own program. It searches
for a file named file first in the directory containing the current file,
then in the quote directories and then the same directories used for
<file>. You can prepend directories to the list of quote directories
with the -iquote option.
So "libpq-fe.h" has a wider search range than <libpq-fe.h> and cannot
be to blame for not finding the file.
It looks like this gesture in Makefile.am shall add the directory with
this file to the list of include directories:
libpostgres_la_CXXFLAGS = -D__WXGTK__ \
-I../../dbinterface \
`pg_config \
--includedir`
What does this command put out:
pg_config --includedir
I understand pg_config belongs to package libpq-dev. Its purpose is told by:
https://www.postgresql.org/docs/current/app-pgconfig.html
Have a nice day :)
Thomas
