[fluid-dev] Audio drivers/lib not found by cmake during building process.

[Loic de MONTAIGNAC]

Hello all,

I successfully went thru the cmake + make build procedure to generate 
the fluidsynth executable but launching it with (i.e):
$ ./fluidsynth -a alsa GPiano.sf2 Ontime.mid returns :
-----
FluidSynth runtime version 2.0.5
Copyright (C) 2000-2019 Peter Hanappe and others.
Distributed under the LGPL license.
SoundFont(R) is a registered trademark of E-mu Systems, Inc.

fluidsynth: warning: No preset found on channel 9 [bank=128 prog=0]
fluidsynth: error: Couldn't find the requested audio driver 'alsa'.
fluidsynth: Valid drivers are: file, oss
Failed to create the audio driver
---
and quits.

After re-trying the full cmake + make procedure, I noticed that quite a 
few packages other than oss were not found by cmake (i.e. Alsa, Jack 
etc.. see below).

-- Checking for module 'sndfile>=1.0.0'
--   No package 'sndfile' found
-- Checking for module 'libpulse-simple>=0.9.8'
--   No package 'libpulse-simple' found
-- Checking for module 'alsa>=0.9.1'
--   No package 'alsa' found
-- Checking for module 'jack'
--   No package 'jack' found
-- Checking for module 'lash-1.0>=0.3'
--   No package 'lash-1.0' found
-- Checking for module 'libsystemd'
--   No package 'libsystemd' found
-- Checking for module 'dbus-1>=1.0.0'
--   No package 'dbus-1' found
-- Looking for ladspa.h
-- Looking for ladspa.h - not found
-- Checking for module 'libinstpatch-1.0'
--   No package 'libinstpatch-1.0' found
-- Checking for module 'sdl2'
--   No package 'sdl2' found
-- Could NOT find READLINE (missing: READLINE_INCLUDE_DIR 
READLINE_LIBRARIES)
*************************************************************
Summary:
Build type:            RelWithDebInfo
Install Prefix:        /usr/local
libsndfile:            no (raw audio file rendering only)
D-Bus:                 no
PulseAudio:            no
JACK:                  no
ALSA:                  no
PortAudio:             no
OSS:                   yes
OpenSLES:              no
Oboe:                  no
MidiShare:             no
CoreAudio:             no
CoreMIDI:              no
Windows:               no
DSound:                no
WaveOut support:       no
WinMidi support:       no
SDL2 support:          no
LADSPA support:        no
LASH support:          no
systemd support:       no
OS/2 DART support:     no
Audio to file driver:  yes
NETWORK Support :      yes
IPV6 Support :         yes
Readline:              no
libinstpatch:          no
Samples type=float:    no (using double)
Profiling:             no
OpenMP 4.0:            yes
Multi-thread support   yes
Debug:                 no
Trap on FPE (debug):   no
Check FPE (debug):     no
UBSan (debug):         no
**************************************************************

Pushing my investigation further with apt list | grep <libname> I found 
that quite a few of the missing libs/drivers (Alsa, Jack, PortAudio, 
PulseAudio etc...) are actually installed by default on my system 
(Ubuntu Mate release 18.10 64-bit) but I am baffled why CMake doesn't 
find them.

Being a Linux and Fluidsynth beginner, I am pretty sure I am overlooking 
something but after now 2 full afternoons 'chewing' on this, I am stuck 
and any help would be greatly appreciated.

Kind regards

Loic de Montaignac