Only in bullet: bullet-double.pc
diff -u bullet-orig/PKGBUILD bullet/PKGBUILD
--- bullet-orig/PKGBUILD	2014-07-28 22:51:20.317401386 +0200
+++ bullet/PKGBUILD	2014-07-31 17:12:29.416492433 +0200
@@ -14,16 +14,18 @@
 depends=()
 makedepends=('cmake' 'doxygen' 'graphviz' 'ttf-dejavu' 'mesa')
 source=(http://bullet.googlecode.com/files/${pkgbase}-${pkgver}-r${_rev}.tgz
-        ${pkgbase}.pc)
+        ${pkgbase}.pc
+        ${pkgbase}-double.pc)
 md5sums=('70b3c8d202dee91a0854b4cbc88173e8'
-         'd1da06deba3b08b884d2212f6838905c')
+         'd1da06deba3b08b884d2212f6838905c'
+         '0942013f256e88fadf9535efe4b91e80')
 
 build() {
-  cd ${pkgbase}-${pkgver}-r${_rev}
+  cd ${srcdir}/${pkgbase}-${pkgver}-r${_rev}
 
   # get a clean build dir
-  [[ -d build ]] && rm -rf build
-  mkdir build && cd build 
+  #[[ -d build ]] && rm -rf build
+  mkdir -p build && cd build 
 
   # generate CMake Makefile
   cmake .. \
@@ -39,27 +41,71 @@
   # compile
   make
 
+  # Build double precision
+
+  cd ${srcdir}/${pkgbase}-${pkgver}-r${_rev}
+
+  # get a clean build dir
+  #[[ -d build-double ]] && rm -rf build-double
+  mkdir -p build-double && cd build-double 
+
+  # generate CMake Makefile
+  cmake .. \
+       -DCMAKE_INSTALL_PREFIX=/usr \
+       -DBUILD_SHARED_LIBS=1 \
+       -DBUILD_DEMOS=0 \
+       -DBUILD_MULTITHREADING=1 \
+       -DBUILD_EXTRAS=1 \
+       -DINSTALL_LIBS=1 \
+       -DINSTALL_EXTRA_LIBS=1 \
+       -DUSE_DOUBLE_PRECISION=On \
+       -DCMAKE_BUILD_TYPE=Release # set =Debug for debugging version
+
+  # compile
+  make
+
   # generate docs
-  cd ..
+  cd ${srcdir}/${pkgbase}-${pkgver}-r${_rev}
   sed -i 's/GENERATE_HTMLHELP.*//g' Doxyfile
 }
 
 package_bullet() {
   optdepends=('bullet-docs: documentation')
 
-  cd ${pkgbase}-${pkgver}-r${_rev}/build
-
   # install it
+  cd ${pkgbase}-${pkgver}-r${_rev}/build
   make DESTDIR=${pkgdir} install
 
+
   # manually handle pkgconfig file
   mkdir -p "${pkgdir}"/usr/lib/pkgconfig
   sed "s|VERSION|${pkgver}|g" ${srcdir}/bullet.pc > ${pkgdir}/usr/lib/pkgconfig/bullet.pc
 
   # install license
   install -Dm644 ../BulletLicense.txt ${pkgdir}/usr/share/licenses/${pkgbase}/LICENSE
-}
+
+    # install double
+  cd ${srcdir}/${pkgbase}-${pkgver}-r${_rev}/build-double
+  make DESTDIR=${srcdir}/double install
+  # remove shared files
+  rm -rf $${srcdir}/double/usr/{include,share}
+  cd ${srcdir}/double/usr/lib
+  for so in *.so; do
+    b=`basename ${so} .so`
+    mv ${so} ${pkgdir}/usr/lib/${b}Double.so
+  done
+  for so in *.so.${pkgver}; do
+    b=`basename ${so} .so.${pkgver}`
+    mv ${so} ${pkgdir}/usr/lib/${b}Double.so.${pkgver}
+  done
+  sed "s|LinearMath;BulletCollisions;BulletDynamics;BulletSoftBody|LinearMathDouble;BulletCollisionsDouble;BulletDynamicsDouble;BulletSoftBodyDouble|g" ${srcdir}/double/usr/lib/cmake/bullet/BulletConfig.cmake > ${pkgdir}/usr/lib/cmake/bullet/BulletDoubleConfig.cmake 
+
+  # manually handle pkgconfig file
+  mkdir -p "${pkgdir}"/usr/lib/pkgconfig
+  sed "s|VERSION|${pkgver}|g" ${srcdir}/bullet-double.pc > ${pkgdir}/usr/lib/pkgconfig/bullet-double.pc
+
+  }
 
 package_bullet-docs() {
   pkgdesc="Documentation for bullet"