I get this when trying an out of tree build of frysk

...

257 problems (257 warnings)*** creating
/to/scratch/swagiaal/frysk.bin/frysk-imports/antlr/antlr/antlr.jar ..
make[2]: Leaving directory
`/to/scratch/swagiaal/frysk.bin/frysk-imports/antlr/antlr'
cp antlr/antlr/antlr.jar .
cd cdtparser && make
make[2]: Entering directory `/to/scratch/swagiaal/frysk.bin/frysk-imports/cdtparser'
rm -rf classdir
mkdir -p classdir
classdir=`cd classdir && pwd` ; \
cd ../../../frysk/frysk-imports/cdtparser ; \
gcj -C -I -O -g -d $classdir @file.list
./org/eclipse/cdt/internal/core/dom/parser/c/CASTEnumerationSpecifier.java: In
class 'org.eclipse.cdt.internal.core.dom.parser.c.CASTEnumerationSpecifier':
./org/eclipse/cdt/internal/core/dom/parser/c/CASTEnumerationSpecifier.java: In
method
'org.eclipse.cdt.internal.core.dom.parser.c.CASTEnumerationSpecifier.addEnumerator(org.eclipse.cdt.core.dom.ast.IASTEnumerationSpecifier$IASTEnumerator)':
./org/eclipse/cdt/internal/core/dom/parser/c/CASTEnumerationSpecifier.java:32:
error: Class
'org.eclipse.cdt.core.dom.ast.c.ICASTEnumerationSpecifier.IASTEnumerator' not
found in type declaration.
                enumerators =
(org.eclipse.cdt.core.dom.ast.IASTEnumerationSpecifier.IASTEnumerator[])
ArrayUtil.append(
org.eclipse.cdt.core.dom.ast.c.ICASTEnumerationSpecifier.IASTEnumerator.class,
enumerators, enumerator );
                                                                               
                                            ^
./org/eclipse/cdt/internal/core/dom/parser/c/CASTEnumerationSpecifier.java: In
method
'org.eclipse.cdt.internal.core.dom.parser.c.CASTEnumerationSpecifier.getEnumerators()':
./org/eclipse/cdt/internal/core/dom/parser/c/CASTEnumerationSpecifier.java:41:
error: Class
'org.eclipse.cdt.core.dom.ast.c.ICASTEnumerationSpecifier.IASTEnumerator' not
found in type declaration.
           enumerators =
(org.eclipse.cdt.core.dom.ast.IASTEnumerationSpecifier.IASTEnumerator[])
ArrayUtil.removeNullsAfter(
org.eclipse.cdt.core.dom.ast.c.ICASTEnumerationSpecifier.IASTEnumerator.class,
enumerators, enumeratorsPos );
                                                                               
                                              ^
2 errors
make[2]: *** [classdir] Error 1
make[2]: Leaving directory `/to/scratch/swagiaal/frysk.bin/frysk-imports/cdtparser'
make[1]: *** [cdtparser/cdtparser.jar] Error 2
make[1]: Leaving directory `/to/scratch/swagiaal/frysk.bin/frysk-imports'
make: *** [all-recursive] Error 1