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    <p>This turned out to be fairly simple in the end - many thanks to everyone in the comments who helped work it out.</p> <p>There were two issues:</p> <h1>Issue 1: gcc compiler wasn't working</h1> <h2>Symptoms:</h2> <p>Functions dependent on gcc fail with the following in the configure log (e.g.<code>/Users/&lt;user&gt;/.rvm/log/ruby-1.9.3-p0/yaml/configure.log</code>):</p> <pre><code>checking for gcc... /usr/bin/gcc-4.2 checking whether the C compiler works... no </code></pre> <p>...and the following in the config log (e.g. <code>/Users/&lt;user&gt;/.rvm/src/yaml-0.1.4/config.log</code>):</p> <pre><code>ld: library not found for -lcrt1.10.6.o </code></pre> <h2>Root issue:</h2> <p>Xcode hasn't been installed properly. Specifically the file <code>/Developer/SDKs/MacOSX10.6.sdk/usr/lib/crt1.10.6.o</code> doesn't exist.</p> <h2>Solution:</h2> <p><a href="http://trac.macports.org/ticket/21784">http://trac.macports.org/ticket/21784</a>: "Try reinstalling Xcode, make sure you choose the "unix development support" option."</p> <h1>Issue 2: RVM wouldn't install ruby 1.9.3</h1> <h2>Symptoms:</h2> <p><code>rvm install ruby 1.9.3</code> fails with <code>ERROR: Error running 'make '</code></p> <p>The corresponding <code>/Users/&lt;user&gt;/.rvm/log/ruby-1.9.3-p0/make.log</code> contains the following segment:</p> <pre><code>compiling openssl_missing.c In file included from openssl_missing.c:22: openssl_missing.h:173: error: conflicting types for ‘BN_rand_range’ /usr/include/openssl/bn.h:411: error: previous declaration of ‘BN_rand_range’ was here openssl_missing.h:177: error: conflicting types for ‘BN_pseudo_rand_range’ /usr/include/openssl/bn.h:412: error: previous declaration of ‘BN_pseudo_rand_range’ was here openssl_missing.c:270: error: conflicting types for ‘BN_rand_range’ /usr/include/openssl/bn.h:411: error: previous declaration of ‘BN_rand_range’ was here openssl_missing.c:278: error: conflicting types for ‘BN_pseudo_rand_range’ /usr/include/openssl/bn.h:412: error: previous declaration of ‘BN_pseudo_rand_range’ was here </code></pre> <h2>Root issue:</h2> <p>Conflicts with previous runs of the install <em>(not entirely sure about this)</em>.</p> <h2>Solution</h2> <p><a href="https://rvm.beginrescueend.com/packages/openssl/">https://rvm.beginrescueend.com/packages/openssl/</a>: clean out the ruby you are trying to install and reinstall:</p> <pre><code>rvm remove 1.9.3 rvm install 1.9.3 </code></pre> <p><em>I also removed two other rubies - ruby-1.9.2-p290 and ruby-1.9.2-p136, which might have had something to do with it...:</em></p>
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    1. POgcc not working - Xcode 3.2.6 - Snow Leopard
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    1. COExcellent write-up: two confounding issues definitely made this one harder to track down than usual -- and a half-installed Xcode that gives you GCC but not the C runtime support library hopefully doesn't happen often. :)
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    2. COIt's so that I search this site before Google! Thank you so much!
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    3. COIf you want to avoid Xcode altogether, you can use `osx-gcc-installer` to get the libs, and then do `CC=/usr/bin/gcc-4.2 rvm install 1.9.3 --with-shared` to install on Lion (probably Snow Leopard, too). It'll be compiled for 64-bit, which is nice.
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