Mac OS 10.15 Catalina issues

I couldn’t get the correct command line tools installed. Installing the full Xcode did it for me.

The directory isn’t working for me, while /Applications/ works for me.
After doing so, I can’t reinstall python by homebrew, I am using Catalina Beta 5 and here’s the error when I was running the reinstallment

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It seems you are still running Xcode 10.15 Your version number for xcode-select should be
xcode-select version 2368.
run the command xcode-select --version and see what outputs
Have you opened Xcode 11 after your installed it? If you haven’t Open the application agree to the terms then try running the command sudo xcode-select -s /Applications/
hope this helps

Thanks for the reply, I already opened Xcode and set up the CLT to Xcode 11.0,
but it seems homebrew can’t find my CLT

Then it builds python from source and it fails to finish.

two things to try:

  1. What happens when you run xcode-select --install ?
  2. Try downloading the command line tools separately and see if that helps.

Are you using bash, zsh, or zsh downloaded from homebrew? Catalina uses zsh now instead of bash
run the command which zsh to find out which one you are running
Additionally, you may need to update your xcode-beta. Please see the following :

I find an issue( which is exactly the problem I am facing. Yes, I need to download the CLT from After I install the CLT, run command brew config

Anyway, the problem was fixed, thank you for your kindly help bro.


Is anyone able to install Python2 while running Catalina?

When running:

brew install python@2

I get the following error:

ln -fsn Versions/Current/Python Python.framework/Python

ln -fsn Versions/Current/Headers Python.framework/Headers

ln -fsn Versions/Current/Resources Python.framework/Resources

clang -isysroot /Applications/ -u _PyMac_Error Python.framework/Versions/2.7/Python -o python.exe \

                                            Modules/python.o \

                                            -ldl  -framework CoreFoundation

DYLD_FRAMEWORK_PATH=/private/tmp/python@2-20190827-29454-1pwlkv6/Python-2.7.16 ./python.exe -E -S -m sysconfig --generate-posix-vars ;\

            if test $? -ne 0 ; then \

                            echo "generate-posix-vars failed" ; \

                            rm -f ./pybuilddir.txt ; \

                            exit 1 ; \


/bin/sh: line 1: 35581 Segmentation fault: 11 DYLD_FRAMEWORK_PATH=/private/tmp/python@2-20190827-29454-1pwlkv6/Python-2.7.16 ./python.exe -E -S -m sysconfig --generate-posix-vars

generate-posix-vars failed

make: *** [pybuilddir.txt] Error 1

Anyone have any thoughts?

Looks like ?

It looks like gettext won’t build under Xcode 11 (tried beta 6 and beta 7). Spews this:

ftello.c:53:12: error: no member named '_flag' in 'struct __sFILE'; did you mean '_flags'?
  if (fp_->_flag & _IOWRT)
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:130:8: note: '_flags' declared here
        short   _flags;         /* flags, below; this FILE is free if 0 */
ftello.c:53:20: error: use of undeclared identifier '_IOWRT'
  if (fp_->_flag & _IOWRT)
ftello.c:64:21: error: no member named '_flag' in 'struct __sFILE'; did you mean '_flags'?
          if ((fp_->_flag & _IONBF) == 0 && fp_->_base != NULL)
/Library/Developer/CommandLineTools/SDKs/MacOSX10.15.sdk/usr/include/_stdio.h:130:8: note: '_flags' declared here
        short   _flags;         /* flags, below; this FILE is free if 0 */
ftello.c:64:50: error: no member named '_base' in 'struct __sFILE'
          if ((fp_->_flag & _IONBF) == 0 && fp_->_base != NULL)
                                            ~~~  ^
ftello.c:65:25: error: no member named '_ptr' in 'struct __sFILE'
            pos += fp_->_ptr - fp_->_base;
                   ~~~  ^
ftello.c:65:37: error: no member named '_base' in 'struct __sFILE'
            pos += fp_->_ptr - fp_->_base;
                               ~~~  ^
6 errors generated.

Since gettext is a dependency of ungodly lots of stuff, this hurts.

I’m not too proficient in C and macOS SDK differences to dig into it deeper, sorry.

An update. Guess I figured out the cause, but still no idea how to fix it.

The configure script for the gnulib component, which replaces “broken” libc functions with its own versions, checks for some undesired behavior of ftell(). It detects that on macOS, if you open a file in “r+” mode, read it up to EOF (by fseek()ing to its end, really), write one more byte, and call ftell() on it, the reported position will be wrong — the file pointer needs to advance as you write more data. There seems to be a known bug on Solaris, just like that.

So the configure script sets a variable telling that ftell() is broken on this system, but gnulib only has a replacement for Solaris, which uses the struct __sFILE as found there, and predictably barfs because __sFILE on Darwin is nothing like that.

How healthy an approach to patching systems that misbehave is left as an exercise to the reader, but here’s one thing: up to and including Mojave, ftell() was working just fine, and the replacement was never needed. Maybe, hm, someone more in the know should report it to Apple before they make a release?

XCode 11 beta 6 (haven’t tried beta 7) also makes openssl@1.0 segfault. A function accepts a pointer; at the callsite, it’s NULL, but in the function itself, it’s something bogus, which, upon dereferencing, gives a segfault. No idea whatsoever how that compiled. :-/

CLT for XCode Beta 7 seem to be unavailable ( Let’s see what tomorrow brings.

I had to downgrade back down to beta 6 as it cause conflicts for me when I upgraded to 7

newbie here, with clt 11 GM brew don’t see xcode-select and keep requesting installing it.

Have you tried installing Xcode from the developer site then run brew config

yes I did. I had to revert to beta 6 to have homwbrew see my clr

I was able to build gettext by setting FTELLO_BROKEN_AFTER_SWITCHING_FROM_READ_TO_WRITE to 0 as described here:

But… ftell() really doesn’t work correctly (per assumptions) on Catalina. You can check that by running the very test program gettext itself is using — ftell() fails expectations. The particular problem with gettext is that it then proceeds to apply a workaround for Solaris, using definitions from the Solaris’ guts.

You can of course set that variable, doesn’t mean your program won’t corrupt your data in the runtime because of this ftell() behavior.

Python now builds successfully on the latest Catalina public beta. I’m not sure if that’s a change in Catalina or somewhere in the Python code, but I’m no longer getting the error when getttext builds.

@johnbrady833 python2 or 3?

First time I tried to install Homebrew, so not sure if it is a Catalina problem or something else. Maybe someone could tell me by looking at the error message? Thanks!

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