It would appear that you have perl installed but not ExtUtils::Embed. Are you installing perl modules via cpan or via packages from yum? Ben Kaufman From: sr-users &lt;sr-users-bounces(a)lists.kamailio.org&gt; On Behalf Of AL RSM Sent: Friday, October 22, 2021 1:20 PM To: sr-users &lt;sr-users(a)lists.kamailio.org&gt; Subject: [SR-Users] "EXTERN.h: No such file or directory" error when compiling Kamailio 5.5 on Centos 7 Hi, While trying to install Kamailio 5.5 on Centos 7 I am getting the following error. Perl is already installed. I verified "EXTERN.h" does not exist on the VM. # make include_modules="tm app_perl" cfg # make prefix=/ all .... .... Can't locate ExtUtils/Embed.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .). BEGIN failed--compilation aborted. Can't locate ExtUtils/Embed.pm in @INC (@INC contains: /usr/local/lib64/perl5 /usr/local/share/perl5 /usr/lib64/perl5/vendor_perl /usr/share/perl5/vendor_perl /usr/lib64/perl5 /usr/share/perl5 .). BEGIN failed--compilation aborted. CC (gcc) [M app_perl.so] perlfunc.o In file included from perlfunc.c:40:0: app_perl_mod.h:37:20: fatal error: EXTERN.h: No such file or directory #include <EXTERN.h> ^ compilation terminated. make[2]: *** [perlfunc.o] Error 1 make[1]: *** [modules] Error 1 make[1]: Leaving directory `/usr/src/kamailio/src' Your help would be much appreciated. Thanks, AL