My gcc compiler is at a custom location /my/path/hpgcc 

I've downloaded the boost sources. Executed bootstrap.sh, but it fails because it runs with the default gcc.

Looking into it, I see that it fails at the first thing it does: building the Boost.Build engine:

```
gcc -o bootstrap/jam0 command.c compile.c debug.c expand.c glob.c hash.c hdrmacro.c headers.c jam.c jambase.c jamgram.c lists.c make.c make1.c newstr.c option.c output.c parse.c pathunix.c pathvms.c regexp.c rules.c scan.c search.c subst.c timestamp.c variable.c modules.c strings.c filesys.c builtins.c pwd.c class.c native.c md5.c w32_getreg.c modules/set.c modules/path.c modules/regex.c modules/property-set.c modules/sequence.c modules/order.c execunix.c fileunix.c

```

(fails because executed with the default gcc, and not my gcc version).

I've tried to change the gcc path in the user-config.jam file, but it doesn't help. Probably because the Boost.Build's build script boost\_1\_47\_0/tools/build/v2/engine/build.sh doesn't use user-config.jam, and just uses the default locations.

Any solution?