Question

Install Unison In CentOS 7

Posted October 23, 2014 19.6k views

Hello I has CentOS 6 and unison installed and worked great and now I am using CentOS 7 and unison does not even exist. I don’t want to install EPEL for CentOS 6 when EPEL exist for CentOS 7. The sad part is EPEL 7 does not have unison.

Thanks

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  • staysynchronize October 23, 2014
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    I tried

    rpm -Uvh http://dl.fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-2.noarch.rpm
yum update
yum install unison

    And the package don’t exist.

    As you can see from the repo the Unison don’t exist:
    http://dl.fedoraproject.org/pub/epel/7/x86_64/u/

    However it exist for older 6 EPEL
    http://dl.fedoraproject.org/pub/epel/6/x86_64/

    And I want to avoid using old EPEL if possible.
    I am open to compile from source but having doing that as well.

    unison-2.40.102]# make
/bin/sh: ocamlc: command not found
/bin/sh: ocamlc: command not found
ocamlc -o mkProjectInfo unix.cma str.cma mkProjectInfo.ml
make: ocamlc: Command not found
UISTYLE = text
Building for Unix
NATIVE = true
THREADS = false
STATIC = false
OSTYPE =
OSARCH =
make tags
/bin/sh: ocamlc: command not found
/bin/sh: ocamlc: command not found
make[1]: Entering directory `/root/unison-2.40.102'
ocamlc -o mkProjectInfo unix.cma str.cma mkProjectInfo.ml
make[1]: ocamlc: Command not found
if [ -f `which etags` ]; then \
    etags *.mli */*.mli *.ml */*.ml */*.m *.c */*.c *.txt \
          ; fi 
which: no etags in (/usr/local/bin:/usr/bin:/usr/local/sbin:/usr/sbin:/home/www/.local/bin:/home/www/bin)
/bin/sh: line 1: etags: command not found
make[1]: [tags] Error 127 (ignored)
make[1]: Leaving directory `/root/unison-2.40.102'
  • asb October 23, 2014
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    Unfortunately, it doesn’t look like it’s packaged anywhere for CentOS 7 yet. To build it from source, you’ll need to install the ocaml package.

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2 answers
staysynchronize October 23, 2014

Got it. It works this way.

How to install Unison in CentOS 7

yum install ocaml ocaml-camlp4-devel ctags ctags-etags

cd ~
wget http://www.seas.upenn.edu/~bcpierce/unison//download/releases/stable/unison-2.40.102.tar.gz
tar xvfz unison-2.40.102.tar.gz
cd unison-2.40.102
make

sudo cp -v unison /usr/local/sbin/

cd ~
rm -fr unison*
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staysynchronize October 24, 2014

One more thing.
You also have to place the “unison” binary in the “/usr/bin” folder else you will get this error from the other end server where you installed unison.

Contacting server...
bash: unison: command not found
Fatal error: Lost connection with the server

so do the following

sudo cp -v unison /usr/local/sbin/
sudo cp -v unison /usr/bin
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