Update instructions for custom build with FLP suite (#1984)

doc/Advanced.md

@@ -894,9 +894,9 @@ cd QualityControl
 git checkout <release> # use the release included in the installed FLP suite
 mkdir build
 cd build
-mkdir ~/installdir
-cmake -DCMAKE_INSTALL_PREFIX=~/installdir ..
-make -j16 install 
+mkdir /tmp/installdir
+cmake -DCMAKE_INSTALL_PREFIX=/tmp/installdir -G Ninja -DCLANG_EXECUTABLE=/opt/o2/bin-safe/clang -DCMAKE_BUILD_TYPE=RelWithDebugInfo ..
+ninja -j16 install 
 ```
 
 ***Compilation on top of a local O2***
@@ -909,31 +909,31 @@ cd AliceO2
 git checkout <release> # use the release included in the installed FLP suite
 mkdir build
 cd build
-cmake -DCMAKE_INSTALL_PREFIX=~/installdir ..
-make -j8 install
+cmake -DCMAKE_INSTALL_PREFIX=/tmp/installdir -G Ninja -DCLANG_EXECUTABLE=/opt/o2/bin-safe/clang -DCMAKE_BUILD_TYPE=RelWithDebugInfo ..
+ninja -j8 install
 
 # QC
 git clone https://github.com/AliceO2Group/QualityControl.git
 cd QualityControl
 git checkout <release> # use the release included in the installed FLP suite
 mkdir build
 cd build
-cmake -DCMAKE_INSTALL_PREFIX=~/installdir .. -DO2_ROOT=~/installdir
-make -j8 install
+cmake -DCMAKE_INSTALL_PREFIX=/tmp/installdir -G Ninja -DCLANG_EXECUTABLE=/opt/o2/bin-safe/clang -DCMAKE_BUILD_TYPE=RelWithDebugInfo -DO2_ROOT=/tmp/installdir ..
+ninja -j8 install
 ```
 
 ***Important step in case several nodes are involved***
 
-In case the workflows will span over several FLPs and/or QC machines, one should `scp` the `installdir` to the other machines in the right home directory. The user on the FLPs is `flp` and `qc` on the QC nodes.
+In case the workflows will span over several FLPs and/or QC machines, one should `scp` the `installdir` to the other machines in the same directory.
 
 **Use it in aliECS**
 
 In the aliECS gui, in the panel "Advanced Configuration", et an extra variable `extra_env_vars` and set it to 
 ```
-PATH=~/installdir/bin/:$PATH LD_LIBRARY_PATH=~/installdir/lib/:$LD_LIBRARY_PATH QUALITYCONTROL_ROOT=~/installdir/
+PATH=/tmp/installdir/bin/:$PATH; LD_LIBRARY_PATH=/tmp/installdir/lib/:/tmp/installdir/lib64/:$LD_LIBRARY_PATH; QUALITYCONTROL_ROOT=/tmp/installdir/; echo
 ```
 
-Replace ~/installdir (which is relative to user flp) with your own path. Make sure that the directory is anyway readable and traversable by user flp.
+Replace `/tmp/installdir` with your own path. Make sure that the directory is anyway readable and traversable by users `flp` and `qc`
 
 ## Switch detector in the workflow _readout-dataflow_