Cross-compilation fails with "g++ not found"

Symptom¶

A cross-compilation build from sources runs into the problem during the configure run with the following error:

Using Source directory: /home/user/squish-6.0.0-qt-embedded-src
Using Build directory: /home/user/Squish/squish-6.0.0-qt-embedded-src
Using g++ compiler for bootstrapping
Compiling configure and build ...
make: g++: Command not found
make: *** [ext_std.o] Error 127

Possible Cause and Suggested Solution¶

While the XCXX environment variable should be set to the cross-compiler the build will still require a compiler producing helper tools native to the host. Unless override with CXX on Linux the GNU compiler g++ is being used.

If above error occurs this typically means two things:

The host system lacks installation of a C++ compiler. On systems with a Debian or Ubuntu base this can be fixed by issuing
```
apt-get install g++
```
as root user.
The g++ executable is installed but not found in one of the directories specified in the PATH variable. Inspect its current value with
```
echo $PATH
```
and add the directory containing the host g++ compiler with:
```
PATH=/path/to/host/compiler/bin:$PATH
```

Before running the configure script again the following check can be made:

which g++

This return the absolute path of g++. If there is no output re-check the value of PATH.