Is
/app/perl a directory? I usually unpack a perl tarball then rename the directory to the perl version number that I just unpacked as the installation prefix. For example:
mv /opt/perl444-27-O1-5.20.0-RC1 /opt
perl444 stands for perl using gcc-4.4.4; the
27 represents the OS which is the 2.6.27 kernel;
O1((that's capital O followed by 1) stands for the optimization flag that I will use; lastly, the version number which I'm using. Next, you probably should set the path for your compiler and its library:
export CC=/opt/444/bin/gcc
export LD_LIBRARY_PATH=/usr/local/lib
Then change directory:
cd /opt/perl444-27-O1-5.20.0-RC1
Now, following
Corion's advice:
./Configure -Dcc=/opt/444/bin/gcc -Dprefix=/opt/perl444-27-O0-5.20.0-R
+C1 -DDEBUGGING
Hit
Enter and it starts the configuration.