mitydsp@mitydsp-dev:/media/MityDSP/Modbus library/libmodbus-3.1.4$ make install
Making install in src
 /bin/mkdir -p '/usr/local/lib'
 /bin/sh ../libtool   --mode=install /usr/bin/install -c   libmodbus.la '/usr/local/lib'
libtool: install: /usr/bin/install -c .libs/libmodbus.so.5.1.0 /usr/local/lib/libmodbus.so.5.1.0
/usr/bin/install: cannot create regular file `/usr/local/lib/libmodbus.so.5.1.0': Permission denied
make[2]: *** [install-libLTLIBRARIES] Error 1
make[1]: *** [install-am] Error 2
make: *** [install-recursive] Error 1
mitydsp@mitydsp-dev:/media/MityDSP/Modbus library/libmodbus-3.1.4$ sudo make install
[sudo] password for mitydsp: 
Making install in src
 /bin/mkdir -p '/usr/local/lib'
 /bin/sh ../libtool   --mode=install /usr/bin/install -c   libmodbus.la '/usr/local/lib'
libtool: install: /usr/bin/install -c .libs/libmodbus.so.5.1.0 /usr/local/lib/libmodbus.so.5.1.0
libtool: install: (cd /usr/local/lib && { cp -pR -f libmodbus.so.5.1.0 libmodbus.so.5 || { rm -f libmodbus.so.5 && cp -pR libmodbus.so.5.1.0 libmodbus.so.5; }; })
libtool: install: (cd /usr/local/lib && { cp -pR -f libmodbus.so.5.1.0 libmodbus.so || { rm -f libmodbus.so && cp -pR libmodbus.so.5.1.0 libmodbus.so; }; })
libtool: install: /usr/bin/install -c .libs/libmodbus.lai /usr/local/lib/libmodbus.la
libtool: finish: PATH="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/X11R6/bin:/sbin" ldconfig -n /usr/local/lib
/sbin/ldconfig.real: /usr/local/lib/libmodbus.so.5 is not a symbolic link

----------------------------------------------------------------------
Libraries have been installed in:
   /usr/local/lib

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the '-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the 'LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the 'LD_RUN_PATH' environment variable
     during linking
   - use the '-Wl,-rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to '/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------
 /bin/mkdir -p '/usr/local/include/modbus'
 /usr/bin/install -c -m 644 modbus.h modbus-version.h modbus-rtu.h modbus-tcp.h '/usr/local/include/modbus'
Making install in doc
make[2]: Nothing to be done for `install-exec-am'.
Making install in tests
make[2]: Nothing to be done for `install-exec-am'.
make[2]: Nothing to be done for `install-data-am'.
make[2]: Nothing to be done for `install-exec-am'.
 /bin/mkdir -p '/usr/local/share/doc/libmodbus'
 /usr/bin/install -c -m 644 MIGRATION README.md '/usr/local/share/doc/libmodbus'
 /bin/mkdir -p '/usr/local/lib/pkgconfig'
 /usr/bin/install -c -m 644 libmodbus.pc '/usr/local/lib/pkgconfig'