doxygen port fail for install

[rz3dvp@…]

>sudo port install doxygen
Warning: The Xcode Command Line Tools don't appear to be installed; most ports will likely fail to build.
Warning: Install them by running `xcode-select --install'.
--->  Computing dependencies for doxygen
--->  Fetching archive for doxygen
--->  Attempting to fetch doxygen-1.8.10_2.darwin_15.x86_64.tbz2 from https://packages.macports.org/doxygen
--->  Attempting to fetch doxygen-1.8.10_2.darwin_15.x86_64.tbz2 from http://nue.de.packages.macports.org/doxygen
--->  Attempting to fetch doxygen-1.8.10_2.darwin_15.x86_64.tbz2 from http://lil.fr.packages.macports.org/doxygen
--->  Fetching distfiles for doxygen
--->  Verifying checksums for doxygen
--->  Extracting doxygen
--->  Applying patches to doxygen
--->  Configuring doxygen
Error: org.macports.configure for port doxygen returned: configure failure: command execution failed
Please see the log file for port doxygen for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_doxygen/doxygen/main.log
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port doxygen failed
AirMacX:/ rz3dvp$ sudo port clean doxygen
--->  Cleaning doxygen
AirMacX:/ rz3dvp$ sudo port clean gnuradio
--->  Cleaning gnuradio
AirMacX:/ rz3dvp$ sudo port install doxygen
Warning: The Xcode Command Line Tools don't appear to be installed; most ports will likely fail to build.
Warning: Install them by running `xcode-select --install'.
--->  Computing dependencies for doxygen
--->  Fetching archive for doxygen
--->  Attempting to fetch doxygen-1.8.10_2.darwin_15.x86_64.tbz2 from https://packages.macports.org/doxygen
--->  Attempting to fetch doxygen-1.8.10_2.darwin_15.x86_64.tbz2 from http://nue.de.packages.macports.org/doxygen
--->  Attempting to fetch doxygen-1.8.10_2.darwin_15.x86_64.tbz2 from http://lil.fr.packages.macports.org/doxygen
--->  Fetching distfiles for doxygen
--->  Verifying checksums for doxygen
--->  Extracting doxygen
--->  Applying patches to doxygen
--->  Configuring doxygen
Error: org.macports.configure for port doxygen returned: configure failure: command execution failed
Please see the log file for port doxygen for details:
    /opt/local/var/macports/logs/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_doxygen/doxygen/main.log
To report a bug, follow the instructions in the guide:
    http://guide.macports.org/#project.tickets
Error: Processing of port oxygen failed

Please help for fix it!

[neverpanic (Clemens Lang)]

Install the command line tools, you're lacking system headers:

8	/opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_doxygen/doxygen/work/doxygen-1.8.10/CMakeFiles/CMakeTmp/CheckIncludeFile.c:1:10: fatal error: 'pthread.h' file not found
9	#include <pthread.h>
10	         ^
11	1 error generated.
12	make[1]: *** [CMakeFiles/cmTC_5b4ec.dir/CheckIncludeFile.c.o] Error 1

In file included from /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_textproc_doxygen/doxygen/work/doxygen-1.8.10/CMakeFiles/CMakeTmp/src.cxx:1:
43	/opt/local/include/iconv.h:54:10: fatal error: 'errno.h' file not found
44	#include <errno.h>
45	         ^
46	1 error generated.
47	make[1]: *** [CMakeFiles/cmTC_7f03f.dir/src.cxx.o] Error 1

[rz3dvp@…]

Thank you for help! xcode-select --install is helpful for me, now oxygen and gnu radio installed without problem!