I don’t understand why this is the case, and would like to understand. If I want only functions f1 and f2 which were introduced in glibc versions v1 and v2, why do I have to build with v2 rather than v3? Shouldn’t the symbols be named something like glibc_v1_f1 and glibc_v2_f2 regardless of whether you’re compiling against glibc v2 or glibc v3? If it is instead something like “compiling against vN uses symbols glibc_vN_f1 and glibc_vN_f2” combined with glibc v3 providing glibc_v1_f1, glibc_v2_f1, glibc_v3_f1, glibc_v2_f2 and glbc_v3_f2… why would it be that way?