# Installing cgx on macos **URL:** \ **Category:** CalculiX GraphiX\ **Created:** [October 10, 2020, 1:32pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250 "2020-10-10T13:32:32Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![praveen](https://avatars.discourse-cdn.com/v4/letter/p/3ec8ea/32.png) [@praveen](https://calculix.discourse.group/u/praveen)\ **Post date:** [October 10, 2020, 1:32pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/1 "2020-10-10T13:32:33Z")
I installed cgx on macos catalina. I am trying to view solution files from ISAAC. When I start cgx like this cgx -isaac2d naca0012 I get a blank window. Also I see some error message ``` $ ~/applications/calculiX/cgx_2.17.1/src/cgx -isaac2d naca0012 Error in:sem_init Error in:sem_init Error in:sem_init Error in:sem_init on a Darwin machine, nodename Praveens-MacBook-Pro.local, release 19.6.0, version Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64, machine x86_64 The HOME was detected:/Users/praveen parameters:3 arguments:2 GL_MAX_EVAL_ORDER:10, mesh threads:1 Try to read 2D-isaac results ``` Will it not work on macos ? Thanks ---
**Author:** ![klaus.wittig](https://avatars.discourse-cdn.com/v4/letter/k/4da419/32.png) [@klaus.wittig](https://calculix.discourse.group/u/klaus.wittig)\ **Post date:** [October 11, 2020, 3:32pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/2 "2020-10-11T15:32:09Z")
Hi Praveen, I never tested cgx on macos. But I could see if your isaac example works on my computer and if not I could try to solve the problem. I just checked a 2d and 3d example on my own linux pc without problems. Klaus ---
**Author:** ![praveen](https://avatars.discourse-cdn.com/v4/letter/p/3ec8ea/32.png) [@praveen](https://calculix.discourse.group/u/praveen)\ **Post date:** [October 11, 2020, 3:47pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/3 "2020-10-11T15:47:45Z")
Thanks a lot for looking into this. I had to remove linking to librt since it does not seem to exist on macos. It compiled fine and I can run the executable. It shows an error as I posted above, but the X11 window opens but it is blank. ---
**Author:** ![klaus.wittig](https://avatars.discourse-cdn.com/v4/letter/k/4da419/32.png) [@klaus.wittig](https://calculix.discourse.group/u/klaus.wittig)\ **Post date:** [October 11, 2020, 3:53pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/4 "2020-10-11T15:53:18Z")
The reading seems to not to take place. You should see something like that: on a Linux machine, nodename linux-gpa9, release 4.12.14-lp151.28.67-default, version #1 SMP Fri Sep 4 15:23:21 UTC 2020 (2c5a14f), machine x86\_64 The HOME was detected:/root parameters:3 arguments:2 GL\_MAX\_EVAL\_ORDER:8, mesh threads:1 Try to read 2D-isaac results RAE2822.g.fmt opened MODEL NAME: isaac Read the Grid nblocks:17 dim:2 block:1 i:52 j:27 nodes:1404 dim:2 block:2 i:27 j:52 nodes:1404 dim:2 block:3 i:22 j:98 nodes:2156 dim:2 block:4 i:98 j:12 nodes:1176 dim:2 block:5 i:14 j:12 nodes:168 dim:2 block:6 i:14 j:27 nodes:378 … … ---
**Author:** ![praveen](https://avatars.discourse-cdn.com/v4/letter/p/3ec8ea/32.png) [@praveen](https://calculix.discourse.group/u/praveen)\ **Post date:** [October 11, 2020, 4:08pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/5 "2020-10-11T16:08:10Z")
Sorry, I did not post full output. I see the following. It also opens the X11 window which does not show any plot. ``` $ ~/applications/calculiX/cgx_2.17.1/src/cgx -isaac2d naca0012 Error in:sem_init Error in:sem_init Error in:sem_init Error in:sem_init on a Darwin machine, nodename Praveens-MacBook-Pro.local, release 19.6.0, version Darwin Kernel Version 19.6.0: Mon Aug 31 22:12:52 PDT 2020; root:xnu-6153.141.2~1/RELEASE_X86_64, machine x86_64 The HOME was detected:/Users/praveen parameters:3 arguments:2 GL_MAX_EVAL_ORDER:10, mesh threads:1 Try to read 2D-isaac results naca0012.g.fmt opened MODEL NAME: isaac Read the Grid nblocks:1 dim:2 block:1 i:226 j:34 nodes:7684 block:1 i:226 j:34 k:1 xyz[0]: 20.000000 0.000000 0.000000 1 xyz[1]: 18.378240 0.000000 0.000000 2 xyz[2]: 15.410865 0.000000 0.000000 3 xyz[3]: 12.948765 0.000000 0.000000 4 xyz[4]: 10.905905 0.000000 0.000000 5 xyz[7679]: 11.767115 18.984750 0.000000 7680 xyz[7680]: 13.555470 18.841985 0.000000 7681 xyz[7681]: 15.827835 18.719570 0.000000 7682 xyz[7682]: 18.541915 18.664370 0.000000 7683 xyz[7683]: 20.000000 18.664370 0.000000 7684 Read the Results naca0012.q.fmt opened The input file "naca0012.qt.nam" could not be opened. -> no turbulence quantities available nblocks:1 dim:2 block:1 i:226 j:34 k:1 lcase.name[0]= basic--- block:1 i:226 j:34 k:1 fsmach:0.800000 alpha:1.250000 Re:1000000.000000 time:0.000000 Elements: 7425 Nodes:7684 Datasets:1 MinElemNr: 1 MaxElemNr: 7425 MinNodNr:1 MaxNodNr:7684 read in 0.010023 sec found elements of type 1: 0 found elements of type 2: 0 found elements of type 3: 0 found elements of type 4: 0 found elements of type 5: 0 found elements of type 6: 0 found elements of type 7: 0 found elements of type 8: 0 found elements of type 9: 7425 found elements of type 10: 0 found elements of type 11: 0 found elements of type 12: 0 gtol calculated:4.945783e-09 ``` ---
**Author:** ![klaus.wittig](https://avatars.discourse-cdn.com/v4/letter/k/4da419/32.png) [@klaus.wittig](https://calculix.discourse.group/u/klaus.wittig)\ **Post date:** [October 12, 2020, 6:49pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/6 "2020-10-12T18:49:08Z")
So the data are stored. Please type plot na all frame You should see the nodes. Type plot e all you should see elements Did it work? ---
**Author:** ![klaus.wittig](https://avatars.discourse-cdn.com/v4/letter/k/4da419/32.png) [@klaus.wittig](https://calculix.discourse.group/u/klaus.wittig)\ **Post date:** [October 12, 2020, 7:34pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/7 "2020-10-12T19:34:12Z")
Ok, it just came to my attention that you got not even a graphic window, just the xterm. And I figured out that you opened one of the original isaac example files.I did that as well and now cgx crashed. So the problem is related to the original result files. I worked only with my own models created with cgx. I will look into that. ---
**Author:** ![klaus.wittig](https://avatars.discourse-cdn.com/v4/letter/k/4da419/32.png) [@klaus.wittig](https://calculix.discourse.group/u/klaus.wittig)\ **Post date:** [October 12, 2020, 8:02pm UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/8 "2020-10-12T20:02:59Z")
Ok, I found the trouble maker. Somehow this statement is not doing what I thought it would: elem[anz-\>e].nr = ++anz-\>e; It has to be replaced by anz-\>e++; elem[anz-\>e-1].nr = anz-\>e; in readIsaac.c and optionally for Duns in readDuns.c The updated code will be available with the next release. ---
**Author:** ![praveen](https://avatars.discourse-cdn.com/v4/letter/p/3ec8ea/32.png) [@praveen](https://calculix.discourse.group/u/praveen)\ **Post date:** [October 13, 2020, 4:14am UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/9 "2020-10-13T04:14:04Z")
Nothing happened when I did this. Still do not see any plots. ---
**Author:** ![WilliamK](https://avatars.discourse-cdn.com/v4/letter/w/90ced4/32.png) [@WilliamK](https://calculix.discourse.group/u/WilliamK)\ **Post date:** [November 26, 2020, 5:59am UTC](https://calculix.discourse.group/t/installing-cgx-on-macos/250/10 "2020-11-26T05:59:52Z")
I have Mac OS/X Catalina but I do not run Calculix under the Mac OS. There are some differences between linux systems and the Mac implementation based on BSD Unix, such as the treatment of capital and lowercase letters in file and module names. My solution was to install Ubuntu Linux on a removable SSD drive. During the install process, the Ubuntu installer puts EFI-Boot records on the Mac disk, making it possible to boot other operating systems than run on Intel processors. I put the results of a Calculix model on a flash drive that I can read when I reboot under the Mac OS. If you must run Calculix at the same time as the Mac OS, consider one of the commercial products that allow you to run Linux or Windows simultaneously with the Mac OS. Another option is Oracle VirtualBox, which is Open Source under the GNU General Public License. I have just found it easier to boot in native mode than to run the virtualizing software, which can introduce bugs that neither the Mac OS and to the guest operating system had alone. Best, –William