The compilation requires a full installation of the package
pari 2.0 (header files and library libpari.so.2). 
Compile with : 

cc -O2 -I/usr/local/include/pari -lpari -lm genus2reduction.c -o genus2reduction 
cc -O2 -I/usr/local/include/pari -L/usr/local/lib -lpari -lm genus2reduction.c -o genus2reduction 

(on a single line) or just type 'make'. This will generate 
an executable file genus2reduction.  You may need to adapt
the procedure to your local configuration. 


