Libg2c. so.0 is needed by compat-gcc-34-g77-3.4.6-4.i386 handle errors Oracle requires compat-gcc upon installation, I encountered the following problem during RHEL5.4: [root @ localhost rpm] # rpm-ivh compat-gcc-34-g77-3.4.6-4.i386.rpmwarning: compat-gcc-34-g77-3.4.6-4.i386.rpm: header V3 DSA signature: NOKEY, key ID 37017186 error: Failed dependencies: compat-libf2c-34 = 3.4.6-4 is needed by compat-gcc-34-g77-3.4.6-4.i386 libg2c. so.0 is needed by compat-gcc-34-g77- 3.4.6-4. i386 this is because the dependency package compat-libf2c-34-3.4.6-4.i386.rpm is installed. [Root @ localhost rpm] # rpm-ivh compat-libf2c-34-3.4.6-4.i386.rpmwarning: compat-libf2c-34-3.4.6-4.i386.rpm: Header V3 DSA signature: NOKEY, key ID 37017186Preparing... ######################################## ### [100%] 1: compat-libf2c-34 ####################################### #### [100%] [root @ localhost rpm] # rpm-ivh compat-gcc-34-g77-3.4.6-4.i386.rpmwarning: compat-gcc-34-g77-3.4.6-4.i386.rpm: headv3 DSA signature: NOKEY, key ID 37017186Preparing... ######################################## ### [100%] 1: compat-gcc-34-g77 ####################################### #### [100%]