Compiling vamp-sdk and Rubber Band on Ubuntu Studio 64

[studio32]

Here's my take on how to solve the pitfalls you might run into when
compiling stuff.

1. Make sure you've got the -devel packages needed.
If configure/make complains about "can't find libsamplerate" or
"jpeg.h missing" or similar, you probably haven't installed the -devel
packages for those programs.

2a. Make sure the linker can find the other libs/programs you compiled.
If you compile things and (per default, usually) install to /usr/local
you need
to make sure the linker finds those libs.
Create a file named local.conf in /etc/ld.so.conf.d and put
/usr/local/lib into it.

2b. Make sure pkgconfig can find your .pc files.
Set PKG_CONFIG_PATH to /usr/local/lib/pkgconfig.

3. Use stow. (Optional but IMHO very usefull)
Stow allows you to install compiled programs to any directory and link
the files to any other (usually /usr/local).
I usually do "./configure --prefix=/opt/<package-name-and-version>" to
install to, say, /opt/audacity-3.5.12 and then run
"stow -d /opt -t /usr/local audacity-3.5.12"
to create symbolic links from /opt/audacity-3.5.12 to /usr/local.
This way it's also very easy to uninstall any self-compiled program;
unstow using
"stow -D -d /opt/ -t /usr/local audacity-3.5.12"
and
"rm -rf /opt/audacity-3.5.12"
and everything's gone.
Using this approach it's also easy to try new new versions and keep
the old as backup.

- Peder
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