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Cannot ./configure in EZSDK of beaglebone black

Hello !

I want to install xenomai in EZSDK of beagle black . So I operate this work by minicom on PC. When I ./configure , there are several errors like follow:

root@am335x-evm:~/xenomai-2.6.3# ./configure                                     
checking build system type... ./config.guess: line 912: echo: write error: Broke
./config.guess: line 917: echo: write error: Broken pipe                        
armv7l-unknown-linux-gnueabihf                                                  
checking host system type... armv7l-unknown-linux-gnueabihf                                      
checking for a BSD-compatible install... ./install-sh -c                                                                                                               
checking for gcc... no                                                          
checking for cc... no                                                           
checking for cl.exe... no                                                       
configure: error: in `/usr/gcc-4.9.1':                                          
configure: error: no acceptable C compiler found in $PATH                       
See `config.log' for more details.

Then , I search this problem in google , some said that it lack gcc .

So , I download the sound code of gcc 4.9.1 .

After I take the document of gcc in the EZSDK , when I ./configure in the document of gcc , there are new errors like follow :

root@am335x-evm:/usr/gcc-4.9.1# ./configure                                     
checking build system type... ./config.guess: line 912: echo: write error: Broke
./config.guess: line 917: echo: write error: Broken pipe                        
armv7l-unknown-linux-gnueabihf                                                  
checking host system type... armv7l-unknown-linux-gnueabihf                     
checking target system type... armv7l-unknown-linux-gnueabihf                   
checking for a BSD-compatible install... ./install-sh -c                        
checking whether ln works... yes                                                
checking whether ln -s works... yes                                             
checking for a sed that does not truncate output... /bin/sed                    
checking for gawk... no                                                         
checking for mawk... no                                                         
checking for nawk... no                                                         
checking for awk... awk                                                         
checking for libatomic support... yes                                           
checking for libcilkrts support... no                                           
checking for libitm support... yes                                              
checking for libsanitizer support... yes                                        
checking for libvtv support... no                                               
checking for gcc... no                                                          
checking for cc... no                                                           
checking for cl.exe... no                                                       
configure: error: in `/usr/gcc-4.9.1':                                          
configure: error: no acceptable C compiler found in $PATH                       
See `config.log' for more details.

Please tell me what wrong it is and how to solve it.

Thx