diff --git a/.gitignore b/.gitignore
index a68020a3..fb988e6b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,56 +1,65 @@
-# Compiled Object files
+# Compiled Object files #
+#########################
 *.slo
 *.lo
 *.o
 *.obj
-*~
-errs
-*#
-INSTALL
 
-# Precompiled Headers
+
+# Editor files #
+################
+*~
+*#
+
+# Precompiled Headers #
+#######################
 *.gch
 *.pch
 
-# Compiled Dynamic libraries
+# Compiled Dynamic libraries #
+##############################
 *.so
 *.dylib
 *.dll
 
-# Fortran module files
+# Fortran module files #
+########################
 *.mod
 
-# Compiled Static libraries
+# Compiled Static libraries #
+#############################
 *.lai
 *.la
 *.a
 *.lib
 
-# Executables
+# Executables #
+###############
 *.exe
 *.out
 *.app
-# http://www.gnu.org/software/automake
 
+# http://www.gnu.org/software/automake #
+########################################
 Makefile.in
 Makefile
 config.log
 config.status
 .deps
 
-# http://www.gnu.org/software/autoconf
-
-/autom4te.cache
-/aclocal.m4
-/compile
-/configure
-/depcomp
-/install-sh
-/missing
-/stamp-h1
-/config.sub
-/config.guess
-/INSTALL
+# http://www.gnu.org/software/autoconf #
+########################################
+autom4te.cache
+aclocal.m4
+compile
+configure
+depcomp
+install-sh
+missing
+stamp-h1
+config.sub
+config.guess
+INSTALL
 
 # Packages #
 ############
@@ -80,3 +89,12 @@ config.status
 .Trashes
 ehthumbs.db
 Thumbs.db
+
+# build directory #
+###################
+build/*
+
+# IDE related files #
+#####################
+*.xcodeproj/*
+build.sh
diff --git a/INSTALL b/INSTALL
deleted file mode 120000
index f812f5a2..00000000
--- a/INSTALL
+++ /dev/null
@@ -1 +0,0 @@
-/usr/share/automake-1.14/INSTALL
\ No newline at end of file
diff --git a/configure b/configure
index cc11a210..64770a5c 100755
--- a/configure
+++ b/configure
@@ -5068,7 +5068,7 @@ main ()
      FILE *f;
       /* Opcodes for xgetbv */
       __asm__(".byte 0x0f, 0x01, 0xd0"
-        : "=a" (eax), "=d" (edx),
+        : "=a" (eax), "=d" (edx)
         : "c" (op));
      f = fopen("conftest_xgetbv", "w"); if (!f) return 1;
      fprintf(f, "%x:%x\n", eax, edx);
@@ -5470,7 +5470,7 @@ main ()
      FILE *f;
       /* Opcodes for xgetbv */
       __asm__(".byte 0x0f, 0x01, 0xd0"
-        : "=a" (eax), "=d" (edx),
+        : "=a" (eax), "=d" (edx)
         : "c" (op));
      f = fopen("conftest_xgetbv", "w"); if (!f) return 1;
      fprintf(f, "%x:%x\n", eax, edx);
diff --git a/lib/GridConfig.h b/lib/GridConfig.h
index 45d07e55..6976175c 100644
--- a/lib/GridConfig.h
+++ b/lib/GridConfig.h
@@ -20,10 +20,10 @@
 #define GRID_COMMS_NONE 1
 
 /* GRID_DEFAULT_PRECISION is DOUBLE */
-#define GRID_DEFAULT_PRECISION_DOUBLE 1
+/* #undef GRID_DEFAULT_PRECISION_DOUBLE */
 
 /* GRID_DEFAULT_PRECISION is SINGLE */
-/* #undef GRID_DEFAULT_PRECISION_SINGLE */
+#define GRID_DEFAULT_PRECISION_SINGLE 1
 
 /* Support Altivec instructions */
 /* #undef HAVE_ALTIVEC */
@@ -120,8 +120,8 @@
 /* Define to 1 if you have the <unistd.h> header file. */
 #define HAVE_UNISTD_H 1
 
-/* NEON ARMv7 Experimental support */
-/* #undef NEONv7 */
+/* NEON ARMv8 Experimental support */
+/* #undef NEONv8 */
 
 /* Name of package */
 #define PACKAGE "grid"
diff --git a/m4/ax_gcc_x86_avx_xgetbv.m4 b/m4/ax_gcc_x86_avx_xgetbv.m4
index 2da9a6ab..c8c1c504 100644
--- a/m4/ax_gcc_x86_avx_xgetbv.m4
+++ b/m4/ax_gcc_x86_avx_xgetbv.m4
@@ -65,7 +65,7 @@ AC_CACHE_CHECK(for x86-AVX xgetbv $1 output, ax_cv_gcc_x86_avx_xgetbv_$1,
      FILE *f;
       /* Opcodes for xgetbv */
       __asm__(".byte 0x0f, 0x01, 0xd0"
-        : "=a" (eax), "=d" (edx), 
+        : "=a" (eax), "=d" (edx) 
         : "c" (op));
      f = fopen("conftest_xgetbv", "w"); if (!f) return 1;
      fprintf(f, "%x:%x\n", eax, edx);