user1766: How should one build the client for the new cryptocoin Primecoin from source code on a mac? 
The source can be found here: https://sourceforge.net/projects/primecoin/files/ 

user129: https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md should work for you as Joe White commented, note you'll have to install Xcode first of all, and in Xcode open preferences - downloads and install the command line tools. I recommend homebrew over macports as it's better maintained and a little more user friendly.
the only difference is that as you're downloading from sourceforge rather than github, you skip the git clone and just find makefile.osx in /src/src/ of the downloaded folder.
you then (assuming you installed homebrew as standard) open makefile.osx in textedit or xcode and change
DEPSDIR=/opt/local

to
DEPSDIR=/usr/local

and you'll probably have to change
 $(DEPSDIR)/lib/db48/libdb_cxx-4.8.a \
 $(DEPSDIR)/lib/libboost_system-mt.a \
 $(DEPSDIR)/lib/libboost_filesystem-mt.a \
 $(DEPSDIR)/lib/libboost_program_options-mt.a \
 $(DEPSDIR)/lib/libboost_thread-mt.a \
 $(DEPSDIR)/lib/libboost_chrono-mt.a \
 $(DEPSDIR)/lib/libssl.a \
 $(DEPSDIR)/lib/libcrypto.a \

to paths more like
 $(DEPSDIR)/Cellar/openssl/1.0.1e/lib/libssl.a \
 $(DEPSDIR)/Cellar/openssl/1.0.1e/lib/libcrypto.a \

Check in /usr/local for the Cellar folder and the libs folder, you could alternately alias each referenced file in /usr/local/libs 

1766: <p>How should one build the client for the new cryptocoin <a href="http://bitcoinmagazine.com/primecoin-the-cryptocurrency-whose-mining-is-actually-useful/" rel="nofollow">Primecoin</a> from source code on a mac? </p>

<p>The source can be found here: <a href="https://sourceforge.net/projects/primecoin/files/" rel="nofollow">https://sourceforge.net/projects/primecoin/files/</a>  </p>
 129: <p><a href="https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md" rel="nofollow">https://github.com/bitcoin/bitcoin/blob/master/doc/build-osx.md</a> should work for you as Joe White commented, note you'll have to install Xcode first of all, and in Xcode open preferences - downloads and install the command line tools. I recommend homebrew over macports as it's better maintained and a little more user friendly.</p>

<p>the only difference is that as you're downloading from sourceforge rather than github, you skip the git clone and just find makefile.osx in /src/src/ of the downloaded folder.</p>

<p>you then (assuming you installed homebrew as standard) open makefile.osx in textedit or xcode and change</p>

<pre><code>DEPSDIR=/opt/local
</code></pre>

<p>to</p>

<pre><code>DEPSDIR=/usr/local
</code></pre>

<p>and you'll probably have to change</p>

<pre><code> $(DEPSDIR)/lib/db48/libdb_cxx-4.8.a \
 $(DEPSDIR)/lib/libboost_system-mt.a \
 $(DEPSDIR)/lib/libboost_filesystem-mt.a \
 $(DEPSDIR)/lib/libboost_program_options-mt.a \
 $(DEPSDIR)/lib/libboost_thread-mt.a \
 $(DEPSDIR)/lib/libboost_chrono-mt.a \
 $(DEPSDIR)/lib/libssl.a \
 $(DEPSDIR)/lib/libcrypto.a \
</code></pre>

<p>to paths more like</p>

<pre><code> $(DEPSDIR)/Cellar/openssl/1.0.1e/lib/libssl.a \
 $(DEPSDIR)/Cellar/openssl/1.0.1e/lib/libcrypto.a \
</code></pre>

<p>Check in /usr/local for the Cellar folder and the libs folder, you could alternately alias each referenced file in /usr/local/libs </p>
