J'ai ajouté des paramètres à la commande configure, comme suit :

./configure jdk=/mod/java/jdk1.6.0_13 compiler=javac

Identify operating system: Fedora Core
Check for required jar files:
- JUnit test framework found

Check Java compilers:
- Eclipse ecj works
- Specified javac works
- GNU gcj -C (bytecode mode) works
- Specified javah found
- Specified jar works
- Specified javadoc found

Check Java virtual machines:
- Specified java VM works
- GNU gij works

Check native compiler:
- GNU gcj works
- GNU gcc compiling doesn't work

Select compiler: javac
Select runtime: java
failed

C compiler not detected

Maintenant, il ne détecte plus le compilateur gcc.