gimp 2.8.18 install fails on el Capitan 10.11.6 with Xcode 6.4

[bakertlh]

:info:build /bin/sh ../libtool  --tag=CC   --mode=compile /usr/bin/clang -DHAVE_CONFIG_H -I. -I.. -I.. -D_REENTRANT -I/opt/local/include/glib-2.0 -I/opt/local/lib/glib-2.0/include -I/opt/local/include  -I/opt/local/include "-xobjective-c" -DPREFIX=\""/opt/local"\" -DGIMPDIR=\"".gimp-2.8"\" -DDATADIR=\""/opt/local/share/gimp/2.0"\" -DLOCALEDIR=\""/opt/local/share/locale"\" -DPLUGINDIR=\""/opt/local/lib/gimp/2.0"\" -DSYSCONFDIR=\""/opt/local/etc/gimp/2.0"\" -DGIMP_PACKAGE=\""gimp"\" -DGIMP_DATA_VERSION=\"2.0\" -DGIMP_USER_VERSION=\"2.8\" -DGIMP_SYSCONF_VERSION=\"2.0\" -DGIMP_PLUGIN_VERSION=\"2.0\" -DG_LOG_DOMAIN=\"LibGimpBase\" -DGIMP_BASE_COMPILATION -I/opt/local/include -DGIMP_DISABLE_DEPRECATED -DBABL_DISABLE_DEPRECATED -DGSEAL_ENABLE -DGDK_DISABLE_DEPRECATED -DGTK_DISABLE_DEPRECATED -DGDK_MULTIHEAD_SAFE -DGTK_MULTIHEAD_SAFE  -pipe -Os -arch x86_64 -Wall -Wdeclaration-after-statement -Wmissing-prototypes -Werror=missing-prototypes -Wstrict-prototypes -Wmissing-declarations -Winit-self -Wpointer-arith -Wold-style-definition -Wmissing-format-attribute -Wformat-security -fno-common -fdiagnostics-show-option   -MT gimpparasiteio.lo -MD -MP -MF .deps/gimpparasiteio.Tpo -c -o gimpparasiteio.lo gimpparasiteio.c
:info:build In file included from gimpenv.c:33:
:info:build In file included from /System/Library/Frameworks/AppKit.framework/Headers/AppKit.h:10:
:info:build In file included from /System/Library/Frameworks/Foundation.framework/Headers/Foundation.h:10:
:info:build In file included from /System/Library/Frameworks/Foundation.framework/Headers/NSArray.h:6:
:info:build /System/Library/Frameworks/Foundation.framework/Headers/NSEnumerator.h:7:15: error: expected ';' after @class
:info:build @class NSArray<ObjectType>;
:info:build               ^
:info:build mv -f .deps/gimpmemsize.Tpo .deps/gimpmemsize.Plo
:info:build /System/Library/Frameworks/Foundation.framework/Headers/NSEnumerator.h:7:16: error: cannot find protocol declaration for 'ObjectType'
:info:build @class NSArray<ObjectType>;
:info:build                ^
:info:build /System/Library/Frameworks/Foundation.framework/Headers/NSEnumerator.h:34:25: error: cannot find protocol declaration for 'ObjectType'
:info:build @interface NSEnumerator<ObjectType> : NSObject <NSFastEnumeration>
:info:build                         ^
:info:build /System/Library/Frameworks/Foundation.framework/Headers/NSEnumerator.h:34:37: error: expected identifier or '('
:info:build @interface NSEnumerator<ObjectType> : NSObject <NSFastEnumeration>
:info:build                                     ^
:info:build /System/Library/Frameworks/Foundation.framework/Headers/NSEnumerator.h:36:13: error: expected ')'
:info:build - (nullable ObjectType)nextObject;
:info:build             ^
:info:build /System/Library/Frameworks/Foundation.framework/Headers/NSEnumerator.h:36:3: note: to match this '('
:info:build - (nullable ObjectType)nextObject;
:info:build

[dbevans (David B. Evans)]

To start with, you need to upgrade to the latest version of Xcode for your platform, Xcode 7.3.1. If you have just upgraded your OS to 10.11.6, make sure you have followed the procedure outlined in the Migration instructions.

[bakertlh]

Thanks. I had forgotten that the Appstore "updates" feature does not cover Xcode updates. After downloading the newer Xcode it compiled without a hitch.