diff --git a/lib/bin/build_lib b/lib/bin/build_lib
index 9d03024f..d75baec0 100755
--- a/lib/bin/build_lib
+++ b/lib/bin/build_lib
@@ -169,7 +169,7 @@ _target_prepare() {
 # --enable-pic --disable-pie to ensure the resulting library can be linked again.
 target_configure() { _target_configure "$@"; }
 _target_configure() {
-    local prefix=$1 platform=$2 arch=$3; shift 3
+    local prefix=$1 platform=$2 arch=$3 host=$arch-$platform; shift 3
 
     case "$platform" in
         'windows')
@@ -188,7 +188,7 @@ _target_configure() {
         ;;
     esac
 
-    ./configure ${host:+--host="$host"} --enable-pic --disable-pie --prefix="$prefix/$arch" "$@"
+    ./configure --build="$(./build-aux/config.guess)" ${host:+--host="$host"} --enable-pic --disable-pie --prefix="$prefix/$arch" "$@"
 }
 
 # target_build <prefix> <platform> <arch>
@@ -305,11 +305,12 @@ _build() {
             'ios') archs=( 'i386' 'x86_64' 'armv7' 'armv7s' 'arm64' ) ;;
             'android') archs=( 'arm' 'arm64' 'x86' 'x86_64' ) ;;
             'windows') archs=( 'Win32' 'x64' ) ;;
-            *) archs=( 'i386' 'x86_64' ) ;;
+            *) archs=( 'x86' 'x86_64' ) ;;
         esac
     fi
 
     local prefix="$PWD/build-$platform~"
+    echo " # $name ($platform: ${archs[*]}) into $prefix ..."
     initialize "$prefix" "$platform"
 
     # "clean" argument wipes the lib clean and exits. If .success exists in prefix output, skip build.
@@ -373,8 +374,19 @@ _build() {
                 # x86    CFLAGS="-march=i686 -mtune=intel -mssse3 -mfpmath=sse -m32"
                 # x86_64 CFLAGS="-march=x86-64 -msse4.2 -mpopcnt -m64 -mtune=intel"
             ;;
+            *)
+                case "$arch" in
+                    x86)
+                        export CFLAGS="-m32"
+                    ;;
+                    x86_64)
+                        export CFLAGS="-m64"
+                    ;;
+                esac
+            ;;
         esac
 
+        echo " # $name ($platform: $arch) ..."
         target "$prefix" "$platform" "$arch"
     ); done