Problems with not finding Framework header files on Mojave 10.14.6

[Greg Earle]

I'm having problems building software on our Mac dev system at work on 
Mojave.

I have Xcode 10.3 installed on it (to ensure it installed the 10.14.6 
SDK).

When I build things (in MacPorts or outside of it) that use Framework 
header files, I get complaints that the header file is not found.

In MacPorts:

--
mojavemac:/ root# port install mercurial
Warning: The macOS 10.14 SDK does not appear to be installed. Ports may 
not build correctly.
Warning: You can install it as part of the Xcode Command Line Tools 
package by running `xcode-select --install'.
--->  Computing dependencies for mercurial
--->  Fetching archive for mercurial
--->  Attempting to fetch mercurial-5.3_1.darwin_18.x86_64.tbz2 from 
https://packages.macports.org/mercurial
--->  Attempting to fetch mercurial-5.3_1.darwin_18.x86_64.tbz2 from 
https://ywg.ca.packages.macports.org/mirror/macports/packages/mercurial
--->  Attempting to fetch mercurial-5.3_1.darwin_18.x86_64.tbz2 from 
http://aus.us.packages.macports.org/macports/packages/mercurial
--->  Fetching distfiles for mercurial
--->  Verifying checksums for mercurial
--->  Extracting mercurial
--->  Applying patches to mercurial
--->  Configuring mercurial
--->  Building mercurial
Error: Failed to build mercurial: command execution failed
Error: See 
/opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mercurial/mercurial/main.log 
for details.
Error: Follow https://guide.macports.org/#project.tickets to report a 
bug.
Error: Processing of port mercurial failed
--

I don't understand why I get complaints about the SDK when it's most 
definitely installed.

--
mojavemac:/ root# xcode-select --install
xcode-select: error: command line tools are already installed, use 
"Software Update" to install updates
--

I verified that both 
"/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk" 
and "/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk" have a 10.14.6 
SDK installed in them.

(I get the same complaints on my office Mac but that has Xcode 11.3.1 on 
it.  I figured it was because that version installs a Catalina SDK.)

Anyway, the mercurial port install log file says

--
[...]
:info:build building 'mercurial.cext.osutil' extension
:info:build /usr/bin/clang -fno-strict-aliasing -fno-common -dynamic 
-pipe -Os 
-isysroot/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk 
-DNDEBUG -g -fwrapv -O3 -Wall -Wstrict-prototypes -arch x86_64 
-isysroot/ -Imercurial 
-I/opt/local/Library/Frameworks/Python.framework/Versions/2.7/include/python2.7 
-c mercurial/cext/osutil.c -o 
build/temp.macosx-10.14-x86_64-2.7/mercurial/cext/osutil.o 
-DHAVE_BSD_STATFS
:info:build mercurial/cext/osutil.c:1334:10: fatal error: 
'ApplicationServices/ApplicationServices.h' file not found
:info:build #include <ApplicationServices/ApplicationServices.h>
:info:build          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
:info:build 1 error generated.
:info:build error: command '/usr/bin/clang' failed with exit status 1
:info:build make: *** [build] Error 1
:info:build make: Leaving directory 
`/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mercurial/mercurial/work/mercurial-5.3'
:info:build Command failed:  cd 
"/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_macports_release_tarballs_ports_devel_mercurial/mercurial/work/mercurial-5.3" 
&& make -j6 -w all 
PYTHON=/opt/local/Library/Frameworks/Python.framework/Versions/2.7/bin/python2.7
:info:build Exit code: 2
:error:build Failed to build mercurial: command execution failed
--

I have the ApplicationServices.h header file, in two different places in 
the SDKs:

--
mojavemac:/ root# locate /ApplicationServices.h
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Headers/ApplicationServices.h
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Headers/ApplicationServices.h
--

but it's not in an "ApplicationServices" directory.

(This same port installs fine on my Sierra 10.12.6 system at home.)

Outside of MacPorts, I'm trying to build Coin/Coin3D 4.0.0 and get 
similar errors:

--
[...]
[ 42%] Building CXX object src/glue/CMakeFiles/glue.dir/dl.cpp.o
/vicar/external/coin/v4.0.0/coin/src/glue/dl.cpp:150:10: fatal error: 
'CoreFoundation/CFBundle.h' file not found
#include <CoreFoundation/CFBundle.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make[2]: *** [src/glue/CMakeFiles/glue.dir/dl.cpp.o] Error 1
make[2]: Target `src/glue/CMakeFiles/glue.dir/build' not remade because 
of errors.
make[1]: *** [src/glue/CMakeFiles/glue.dir/all] Error 2
[ 43%] Built target io
[ 44%] Built target manips
[ 48%] Built target misc
[ 48%] Building CXX object 
src/rendering/CMakeFiles/rendering.dir/SoOffscreenCGData.cpp.o
/vicar/external/coin/v4.0.0/coin/src/rendering/SoOffscreenCGData.cpp:40:10: 
fatal error:
       'ApplicationServices/ApplicationServices.h' file not found
#include <ApplicationServices/ApplicationServices.h>
          ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1 error generated.
make[2]: *** 
[src/rendering/CMakeFiles/rendering.dir/SoOffscreenCGData.cpp.o] Error 1
make[2]: Target `src/rendering/CMakeFiles/rendering.dir/build' not 
remade because of errors.
make[1]: *** [src/rendering/CMakeFiles/rendering.dir/all] Error 2
--

Again, I have the "not found" header files in the 2 MacOSX SDKs:

--
mac:/ root# locate /CFBundle.h | grep -v Prev
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreFoundation.framework/Versions/A/Headers/CFBundle.h
[...]
/Library/Developer/CommandLineTools/SDKs/MacOSX.sdk/System/Library/Frameworks/CoreFoundation.framework/Versions/A/Headers/CFBundle.h
--

it's just not living in a directory called "CoreFoundation".

Am I missing something obvious?  🤷🏼‍♂️

(Apologies for the length.)

		- Greg