I've tested ClamAV 0.96.x and ClamAV 0.97.x for building on Mac OS X, and now I'm running the latest stable release: ClamAV 0.97.3.

In last update, Clam AntiVirus developer team introduced JIT compiler to ClamAV® 0.96.
Apple gcc (version: 4.0.1 build: 5370) in Mac OS X 10.4 (aka Tiger) failed to build ClamAV 0.96.x and 0.97.x with JIT compiled in.
With a brief struggle I found a good solution that I will tell you here.

  1) First, install LLVM (Low Level Virtual Machine) and LLVM-GCC 4.2 Front End.
  2) Second, add this configuration option: --enable-llvm.

Then you can build ClamAV 0.96.x and 0.97.x with JIT compiled in and use new features included in anti-virus toolkit.

1. Installing LLVM-GCC 4.2 Front End Binaries

cd ~
curl -O http://llvm.org/releases/2.3/llvm-gcc4.2-2.3-x86-darwin8.tar.gz
cd /usr/local
sudo tar zxf ~/llvm-gcc4.2-2.3-x86-darwin8.tar.gz



2. Setting search path

export PATH=/usr/local/llvm-gcc4.2-2.3-x86-darwin8/bin:$PATH



3. Installing LLVM 2.3

curl -O http://llvm.org/releases/2.3/llvm-2.3.tar.gz
tar zxf llvm-2.3.tar.gz
cd llvm-2.3
./configure
make
sudo make install

1. Installing MacPorts
   Go to their Installing MacPorts page, download the .dmg for your platform, and install it.
   Ensure it's up to date by running:

sudo port selfupdate
sudo port sync



2. Installing the packages: bzip2 & check
   

sudo port install bzip2 check



3. Maintaining MacPorts and installed packages

sudo port -d selfupdate
sudo port -d sync
sudo port upgrade installed

1. ./configure

cd clamav-0.97.x
export CFLAGS="-O3 -march=i686"
export CXXFLAGS="-O3 -march=i686"
export LDFLAGS="-O3 -march=i686 -L/opt/local/lib"
export CC=/usr/local/llvm-gcc4.2-2.3-x86-darwin8/bin/i686-apple-darwin8-gcc-4.2.1
./configure --prefix=/usr/local/clamXav --build=i686-apple-darwin`uname -r`
--enable-llvm --enable-check



2. Make, make check and install ClamAV

make && make check
sudo make install

PPC users have to install LLVM-GCC 4.2 Front End Binaries for PPC and configure ClamAV 0.96.x and 0.97.x with different configuration.

1. Installing LLVM-GCC 4.2 Front End Binaries

cd ~
curl -O http://llvm.org/releases/2.3/llvm-gcc4.2-2.3-ppc-darwin8.11.0.tar.gz
cd /usr/local
sudo tar zxf ~/llvm-gcc4.2-2.3-ppc-darwin8.11.0.tar.gz



2. Setting search path

export PATH=/usr/local/llvm-gcc4.2-2.3-ppc-darwin8.11.0/bin:$PATH



3. Installing LLVM 2.3

curl -O http://llvm.org/releases/2.3/llvm-2.3.tar.gz
tar zxf llvm-2.3.tar.gz
cd llvm-2.3
./configure
make
sudo make install

1. Installing MacPorts
   Go to their Installing MacPorts page, download the .dmg for your platform, and install it.
   Ensure it's up to date by running:

sudo port selfupdate
sudo port sync



2. Installing the packages: bzip2 & check
   

sudo port install bzip2 check



3. Maintaining MacPorts and installed packages

sudo port -d selfupdate
sudo port -d sync
sudo port upgrade installed

1. ./configure

cd clamav-0.97.x
export CFLAGS="-O3"
export CXXFLAGS="-O3"
export LDFLAGS="-O3 -L/opt/local/lib"
export CC=/usr/local/llvm-gcc4.2-2.3-ppc-darwin8.11.0/bin/powerpc-apple-darwin8-gcc-4.2.1
./configure --prefix=/usr/local/clamXav --enable-llvm --enable-check



2. Make and install ClamAV

make && make check
sudo make install

Mac OS X 10.6 & 10.7 has its built-in LLVM (Low Level Virtual Machine), so you can simply build ClamAV 0.96.x and 0.97.x with JIT compiled in and use new features included in anti-virus toolkit.

1. Installing MacPorts
   Go to their Installing MacPorts page, download the .dmg for your platform, and install it.
   Ensure it's up to date by running:

sudo port selfupdate
sudo port sync



2. Installing the packages: bzip2 & check
   

sudo port install bzip2 check



3. Maintaining MacPorts and installed packages

sudo port -d selfupdate
sudo port -d sync
sudo port upgrade installed

1. ./configure

cd clamav-0.97.x
export CFLAGS="-O3 -march=nocona"
export CXXFLAGS="-O3 -march=nocona"
export LDFLAGS="-O3 -march=nocona -L/opt/local/lib"
./configure --prefix=/usr/local/clamXav --build=i686-apple-darwin`uname -r`
--enable-llvm --enable-check



2. Make, make check and install ClamAV

make && make check
sudo make install

1. I'm running clamd as daemon with LaunchDaemons:
   /Library/LaunchDaemons/org.clamav.clamd.plist

sudo chown root:wheel /Library/LaunchDaemons/org.clamav.clamd.plist
sudo chmod 0644 /Library/LaunchDaemons/org.clamav.clamd.plist



2. I'm running freshclam as daemon with StartupItems:
   /Library/StartupItems/FreshClamDaemon/FreshClamDaemon
   /Library/StartupItems/FreshClamDaemon/StartupParameters.plist

sudo chown root:wheel /Library/StartupItems/
sudo chmod 0755 /Library/StartupItems/
sudo chown -R root:wheel /Library/StartupItems/FreshClamDaemon/
sudo chmod 0755 /Library/StartupItems/FreshClamDaemon/FreshClamDaemon
sudo chmod 0644 /Library/StartupItems/FreshClamDaemon/StartupParameters.plist


FreshClamDaemon is originally developped by Yuji Okamura.


3. Edit clamd.conf and freshclam.conf.


4. Appropriate permissions for ClamXav.

sudo bash
chown -R root:admin /usr/local/clamXav
chown -R root:admin /usr/local/clamXav/etc
chmod 0775 /usr/local/clamXav/etc
chmod 0644 /usr/local/clamXav/etc/*
chown -R root:admin /usr/local/clamXav/bin
chmod 0755 /usr/local/clamXav/bin
chmod 0755 /usr/local/clamXav/bin/*
chown -R clamav:clamav /usr/local/clamXav/share/clamav
chmod -R g+w /usr/local/clamXav/share/clamav
chmod -R u+w /usr/local/clamXav/share/clamav
chmod 0755 /usr/local/clamXav/share/clamav
chmod 0644 /usr/local/clamXav/share/clamav/*
chmod 0644 /usr/local/clamXav/share/clamav/freshclam.log
chown clamav:admin /var/log/clamd.log
chmod 0664 /var/log/clamd.log

1. I'm running ClamXav Sentry as launchd agent with LaunchAgents:
   /Library/LaunchAgents/org.clamXavSentry.plist

sudo chown root:wheel /Library/LaunchAgents/org.clamXavSentry.plist
sudo chmod 0644 /Library/LaunchAgents/org.clamXavSentry.plist



2. Mac OS X 10.4 doesn't support 'SuccessfulExit' flag in the launchd config plist.