Flair Geoviewer cannot compile and install

Installation
1

Dear FLUKA expert, I compiled and installed the Flair geoviewer3.4-5.2.tgz using source on the CentOS 7 system. The Python version is 3.13. The following error occurred:

g++: fatal error: no input files

compilation terminated.

make: *** [geometryobject.o] Error 1

make: *** [geoviewer.o] Error 1

make: *** [gmesh.o] Error 1

make: *** [gobject.o] Error 1

make: *** [pyutils.o] Error 1

make: *** [viewerobject.o] Error 1

After manually compiling and generating these xxxx. o files, I executed the commands “make” and “make install DESTDIR=my_flair_path”. Flair can be opened normally, but once I click on the Geometry option, Flair immediately crashes. I don’t know how to solve this problem anymore, and I hope the experts can provide help. Thank you very much.

2

Dear yaoxuan,

Sorry for the late reply.

What command did you use which gave the g++: fatal error: no input files error message?
Which veresion of g++ are you using on CentOS 7?

Cheers,
David

3

Dear Dávid,
Thank you for your reply.

This is the complete command for me to install Flair Geoviewer:
tar -zxvf flair-geoviewer-3.4-5.2.tgz
cd flair-geoviewer-3.4
make

It will display:
g++: fatal error: no input files
compilation terminated.
make: *** [geometryobject.o] Error 1

Due to the display error indicating that the file ‘geometriobject. o’ does not exist, I used the following command to compile and generate the geometriobject. o file separately:
g++ -I/public/home/cuiyx/miniconda3/include/python3.13
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/data
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/farm
-I//public/home/cuiyx/Flair/flair-geoviewer-3.4/geometry
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/gldraw
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/graph
-I//public/home/cuiyx/Flair/flair-geoviewer-3.4/math
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/physics
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/tool
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/viewer
-I/public/home/cuiyx/Flair/flair-geoviewer-3.4/xdraw
-std=c++17
-fPIC -c geometryobject.cc -o geometryobject.o

Then I continue to use the ‘make’ command for compilation, and it will continue to report errors
g++: fatal error: no input files
compilation terminated.
make: *** [geoviewer.o] Error 1

I used the above method to compile all the missing *****. o files separately, and finally completed the compilation and installation of Flair Geoviewer using the make command without any problems. However, when I ran Flair and clicked on the geometry option, Flair crashed and exited.

I am using the version g++9.5.

This is an upgrade installation, and there were no issues with the previous version installation.

4

Dear yaoxuan,

the issue seems to be with your anaconda/miniconda environment. The crash usually happens when greoviewer was compiled incorrectly.

I would suggest to install g++ and python natively from source and try again.

Cheers,
David

5

Dear Dávid,

I have recompiled and installed gcc and Python. This time, the versions are gcc15.2 and Python 12.12.

But the same problem still occurred when I used the “make” command. Here is the error message for this time：

g++ -c -m64 -g -DUNIX -std=c++17 -O3 -DNDEBUG -D_DEBUG=0 -DTHREAD -pedantic -W -Wall -Wcast-qual -Wextra -Wformat -Wpointer-arith -Wshadow -Wno-write-strings -Wcast-align -Wredundant-decls -Wno-long-long -Wno-non-virtual-dtor -Wno-variadic-macros -Woverloaded-virtual -Wpointer-arith -Wshadow -Wunused -Wuninitialized -Wwrite-strings -Wshadow -pthread -Wno-class-memaccess -Wno-vla -fpic -fno-strict-aliasing -I. -I.. -I -I/public/home/cuiyx/python3.12/include/python3.12 -I/public/home/cuiyx/python3.12/include/python3.12

g++: fatal error: no input files
compilation terminated.
make: *** [geometryobject.o] Error1

From the error message, it appears that the above command is missing the input file for the “*******. cc” file.
I manually modified this command:
g++ -c -m64 -g -DUNIX -std=c++17 -O3 -DNDEBUG -D_DEBUG=0 -DTHREAD -pedantic -W -Wall -Wcast-qual -Wextra -Wformat -Wpointer-arith -Wshadow -Wno-write-strings -Wcast-align -Wredundant-decls -Wno-long-long -Wno-non-virtual-dtor -Wno-variadic-macros -Woverloaded-virtual -Wpointer-arith -Wshadow -Wunused -Wuninitialized -Wwrite-strings -Wshadow -pthread -Wno-class-memaccess -Wno-vla -fpic -fno-strict-aliasing -I. -I.. -I -I/public/home/cuiyx/python3.12/include/python3.12 -I/public/home/cuiyx/python3.12/include/python3.12 geometryobject.cc

I manually generated the “********. o” file corresponding to the “*******. cc” file. The compilation can continue, and the command ‘make install DESTDIR=my_flair_path’ was successfully executed. But after running Flair, it still shows that the Geometry module is not installed.

7

Can you try the following
go to the directory of geoviewer, there should be a geoviewer.so file generated from the makefile
Open python and type

$ python
Python 3.13.7 (main, Nov 24 2025, 20:51:28) [GCC 15.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import geoviewer
>>>

If you see any errors appearing after import it might reveal any error in the compilation