title: How to resolve "ERROR: libx264 not found"?
body: <p>I needed to install ffmpeg with libx264 support for enabling H.264 encoding . I installed libx264 successfully using the below script with toolchains available in android-ndk-r9d .</p>
  
  <pre><code> #!/bin/bash
   NDK=~/android-ndk-r9d
   SYSROOT=$NDK/platforms/android-8/arch-arm/
   TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64
   function build_one
   {
   ./configure \
   --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
   --sysroot="$SYSROOT" \
   --host=arm-linux \
   --enable-pic \
   --enable-shared \
   --disable-cli
   make clean
   make
   make install
   }
   build_one 
  </code></pre>
  
  <p>Now I wanted to build ffmpeg with libx264 support .  I used the below script with --enable-libx264 , --enable-nonfree , --enable-gpl options as in the below script . </p>
  
  <pre><code>#!/bin/bash
  NDK=~/android-ndk-r9d
  SYSROOT=$NDK/platforms/android-8/arch-arm/
  TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/linux-x86_64
  function build_one
  {
  ./configure \
  --prefix=$PREFIX \
  --enable-shared \
  --enable-nonfree \
  --enable-gpl \
  --enable-libx264 \
  --disable-doc \
  --disable-ffmpeg \
  --disable-ffplay \
  --disable-ffprobe \
  --disable-ffserver \
  --disable-avdevice \
  --disable-doc \
  --disable-symver \
  --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
  --target-os=linux \
  --arch=arm \
  --enable-cross-compile \
  --sysroot=$SYSROOT \
  --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
  --extra-ldflags="$ADDI_LDFLAGS" \
  $ADDITIONAL_CONFIGURE_FLAG
  make clean
  make
  make install
  }
  CPU=arm
  PREFIX=$(pwd)/android/$CPU
  ADDI_CFLAGS="-marm"
  build_one
  </code></pre>
  
  <p>But when I run the script I'm getting error "ERROR: libx264 not found" .</p>
  
  <p>I suppose ffmpeg is not able to figure out the installed location of libx264 . After libx264 installation I have libx264.so file in /usr/local/lib executable at /usr/local/bin and header files at /usr/local/include directories .</p>
  
  <p>What all changes do I need to make to the ffmpeg build script in-order to make it detect libx264?</p>
  
  <p>Note : I am using Ubuntu 12.04(64 bit) for cross compiling .</p>