See INSTALL file for instructions on how to install SpeexDSP. SpeexDSP is a patent-free, Open Source/Free Software DSP library.
Speex audio processing library (Mirror of https://gitlab.xiph.org/xiph/speexdsp.git) | (Required by speex) | (PKGBUILD: https://archlinux.org/packages/extra/x86_64/speexdsp • https://aur.archlinux.org/packages/speexdsp-git))