recipe for target 'aclocal.m4' failed

[Caro-Ca]

Hi!
I have a problem downloading Clustal Omega. After I type ''make" I have got this message:

> ~/Clustal_Omega/ext_apps/src/clustal-omega-1.2.1$ make
> cd . && /bin/sh /Users/jhc/_Devel/ext_apps/src/clustal-omega-1.2.1/missing --run aclocal-1.10 -I m4
> /bin/sh: 0: Can't open /Users/jhc/_Devel/ext_apps/src/clustal-omega-1.2.1/missing
> Makefile:260: recipe for target 'aclocal.m4' failed
> make: *** [aclocal.m4] Error 127

argtable2 is installed so I don't know what happened. Hope you could help me out.
Thank you in advance.