blurhash.sh

[root@07e7105e2127 /]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
[root@07e7105e2127 /]# gcc -v
Using built-in specs.
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/libexec/gcc/x86_64-redhat-linux/4.8.5/lto-wrapper
Target: x86_64-redhat-linux
Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --with-bugurl=http://bugzilla.redhat.com/bugzilla --enable-bootstrap --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-gnu-unique-object --enable-linker-build-id --with-linker-hash-style=gnu --enable-languages=c,c++,objc,obj-c++,java,fortran,ada,go,lto --enable-plugin --enable-initfini-array --disable-libgcj --with-isl=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/isl-install --with-cloog=/builddir/build/BUILD/gcc-4.8.5-20150702/obj-x86_64-redhat-linux/cloog-install --enable-gnu-indirect-function --with-tune=generic --with-arch_32=x86-64 --build=x86_64-redhat-linux
Thread model: posix
gcc version 4.8.5 20150623 (Red Hat 4.8.5-36) (GCC)
[root@07e7105e2127 /]# gem install blurhash -v 0.1.2
Building native extensions.  This could take a while...
ERROR:  Error installing blurhash:
        ERROR: Failed to build gem native extension.

    /usr/bin/ruby extconf.rb
creating Makefile

make "DESTDIR="
gcc -I. -I/usr/include -I/usr/include/ruby/backward -I/usr/include -I.   -fPIC -O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -mtune=generic -fPIC -m64 -o encode.o -c encode.c
encode.c: In function 'blurHashForPixels':
encode.c:28:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int y = 0; y < yComponents; y++) {
  ^
encode.c:28:2: note: use option -std=c99 or -std=gnu99 to compile your code
encode.c:29:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for(int x = 0; x < xComponents; x++) {
   ^
encode.c:48:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for(int i = 0; i < acCount * 3; i++) {
   ^
encode.c:62:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int i = 0; i < acCount; i++) {
  ^
encode.c: In function 'multiplyBasisFunction':
encode.c:75:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int y = 0; y < height; y++) {
  ^
encode.c:76:3: error: 'for' loop initial declarations are only allowed in C99 mode
   for(int x = 0; x < width; x++) {
   ^
encode.c: In function 'encode_int':
encode.c:129:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int i = 0; i < length - 1; i++) divisor *= 83;
  ^
encode.c:131:10: error: redefinition of 'i'
  for(int i = 0; i < length; i++) {
          ^
encode.c:129:10: note: previous definition of 'i' was here
  for(int i = 0; i < length - 1; i++) divisor *= 83;
          ^
encode.c:131:2: error: 'for' loop initial declarations are only allowed in C99 mode
  for(int i = 0; i < length; i++) {
  ^
make: *** [encode.o] Error 1


Gem files will remain installed in /usr/local/share/gems/gems/blurhash-0.1.2 for inspection.
Results logged to /usr/local/share/gems/gems/blurhash-0.1.2/ext/blurhash/gem_make.out

[root@07e7105e2127 /]# gem install blurhash -v 0.1.2 -- --with-cflags="-std=c99"
Building native extensions with: '--with-cflags=-std=c99'
This could take a while...
Successfully installed blurhash-0.1.2
Parsing documentation for blurhash-0.1.2
Installing ri documentation for blurhash-0.1.2
1 gem installed