Having difficulty installing ruby-filemagic gem on new RHEL6 server

问题

It appears to be looking for the libmagic.so.1 file. I have that file. It is located in /usr/lib64. I am not running this installation as the root user.

I am also using rvm and Bundler. This is the result of my "bundle" command, when it gets to the ruby-filemagic line in my Gemfile:

[server@mine ext]$ ruby extconf.rb --with-magiclib
checking for magic_open() in -ltrue... no
*** ERROR: missing required library to compile this module
*** extconf.rb failed ***
Could not create Makefile due to some reason, probably lack of
necessary libraries and/or headers.  Check the mkmf.log file for more
details.  You may need configuration options.

UPDATE:

Here are the results of the mkmf.log:

have_library: checking for magic_open() in -ltrue... -------------------- no

"gcc -o conftest -I. -I/usr/local/rvm/rubies/ruby-1.8.7-p358/lib/ruby/1.8/x86_64-linux -I.    -g -O2  -fPIC   conftest.c  -L. -L/usr/local/rvm/rubies/ruby-1.8.7-p358/lib -Wl,-R/usr/local/rvm/rubies/ruby-1.8.7-p358/lib -L.  -rdynamic -Wl,-export-dynamic     -lruby-static -ltrue  -lrt -ldl -lcrypt -lm   -lc"
conftest.c: In function ‘t’:
conftest.c:3: error: ‘magic_open’ undeclared (first use in this function)
conftest.c:3: error: (Each undeclared identifier is reported only once
conftest.c:3: error: for each function it appears in.)
checked program was:
/* begin */
1: /*top*/
2: int main() { return 0; }
3: int t() { void ((*volatile p)()); p = (void ((*)()))magic_open; return 0; }
/* end */

"gcc -o conftest -I. -I/usr/local/rvm/rubies/ruby-1.8.7-p358/lib/ruby/1.8/x86_64-linux -I.    -g -O2  -fPIC   conftest.c  -L. -L/usr/local/rvm/rubies/ruby-1.8.7-p358/lib -Wl,-R/usr/local/rvm/rubies/ruby-1.8.7-p358/lib -L.  -rdynamic -Wl,-export-dynamic     -lruby-static -ltrue  -lrt -ldl -lcrypt -lm   -lc"
/usr/bin/ld: cannot find -ltrue
collect2: ld returned 1 exit status
checked program was:
/* begin */
1: /*top*/
2: int main() { return 0; }
3: int t() { magic_open(); return 0; }
/* end */

---

I can't figure out what to do to make this work.

回答1:

Had same problem on Ubuntu 12.04. Just installed libmagic-dev package through following command:

sudo apt-get install libmagic-dev

回答2:

On a Mac, using homebrew:

sudo brew install libmagic

回答3:

I needed to do:

yum install file-devel

That apparently contains the libmagic header files that the filemagic ruby gem required in order to compile. It worked like a champ after that.

回答4:

I had the same problem on OpenSuse 11.3. This helped:

zypper install file-devel

来源：https://stackoverflow.com/questions/10338960/having-difficulty-installing-ruby-filemagic-gem-on-new-rhel6-server