Fix checking of libraries (and return missing ones) & Update libpng

Author: piranna

static/ensure_deps.sh

@@ -9,7 +9,7 @@ GIFLIB_VERSION=4.2.3
 GLIB_VERSION=2.50.2
 HARFBUZZ_VERSION=1.4.2
 LIBJPEG_VERSION=1.2.1
-LIBPNG_VERSION=1.2.56
+LIBPNG_VERSION=1.6.37
 PANGO_VERSION=1.40.3
 PIXMAN_VERSION=0.32.6
 ZLIB_VERSION=1.2.11
@@ -23,7 +23,7 @@ GIFLIB_URL=http://sourceforge.net/projects/giflib/files/giflib-4.x/giflib-$GIFLI
 GLIB_URL=https://download.gnome.org/sources/glib/2.50/glib-$GLIB_VERSION.tar.xz
 HARFBUZZ_URL=https://www.freedesktop.org/software/harfbuzz/release/harfbuzz-$HARFBUZZ_VERSION.tar.bz2
 LIBJPEG_URL=http://downloads.sourceforge.net/project/libjpeg-turbo/$LIBJPEG_VERSION/libjpeg-turbo-$LIBJPEG_VERSION.tar.gz
-LIBPNG_URL=http://sourceforge.net/projects/libpng/files/libpng12/$LIBPNG_VERSION/libpng-$LIBPNG_VERSION.tar.xz
+LIBPNG_URL=http://sourceforge.net/projects/libpng/files/libpng16/$LIBPNG_VERSION/libpng-$LIBPNG_VERSION.tar.xz
 PANGO_URL=http://ftp.gnome.org/pub/GNOME/sources/pango/1.40/pango-$PANGO_VERSION.tar.xz
 PIXMAN_URL=http://cairographics.org/releases/pixman-$PIXMAN_VERSION.tar.gz
 ZLIB_URL=https://sourceforge.net/projects/libpng/files/zlib/$ZLIB_VERSION/zlib-$ZLIB_VERSION.tar.gz

util/has_lib.js

@@ -65,10 +65,10 @@ function hasLdconfig () {
   try {
     // Add /sbin to path as ldconfig is located there on some systems -- e.g.
     // Debian (and it can still be used by unprivileged users):
-    childProcess.execSync('export PATH="$PATH:/sbin"')
-    process.env.PATH = '...'
+    execSync('export PATH="$PATH:/sbin"')
+    // process.env.PATH = '...'
     // execSync throws on nonzero exit
-    childProcess.execSync('hash ldconfig 2>/dev/null')
+    execSync('hash ldconfig 2>/dev/null')
     return true
   } catch (err) {
     return false
@@ -96,7 +96,7 @@ function hasPkgconfigLib (lib) {
 function main (query) {
   if (!query) {
     for (var libname of ['gif', 'jpeg', 'cairo', 'pango', 'freetype', 'rsvg']) {
-      if (!main(libname)) return false
+      if (!main(libname)) return libname
     }
 
     return true