If GTK2 development packages are not installed, make is rather noisy:

$ make -C tools/perf O=/tmp/pbuild
Package gtk+-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-2.0' found
make: Entering directory `/opt/sw/ahern/perf.git/tools/perf'
Makefile:593: GTK2 not found, disables GTK2 support. Please install gtk2-devel 
or libgtk2.0-dev
PERF_VERSION = 3.6.rc1.205.gdb146f.dirty
make: Leaving directory `/opt/sw/ahern/perf.git/tools/perf'
Package gtk+-2.0 was not found in the pkg-config search path.
Perhaps you should add the directory containing `gtk+-2.0.pc'
to the PKG_CONFIG_PATH environment variable
No package 'gtk+-2.0' found
make: Entering directory `/opt/sw/ahern/perf.git/tools/perf'
Makefile:593: GTK2 not found, disables GTK2 support. Please install gtk2-devel 
or libgtk2.0-dev
...

Silence the pkg-config errors. Aftewards:

$ make -C tools/perf O=/tmp/pbuild
make: Entering directory `/opt/sw/ahern/perf.git/tools/perf'
Makefile:593: GTK2 not found, disables GTK2 support. Please install gtk2-devel 
or libgtk2.0-dev
PERF_VERSION = 3.6.rc1.206.gd43ff9.dirty
make: Leaving directory `/opt/sw/ahern/perf.git/tools/perf'
make: Entering directory `/opt/sw/ahern/perf.git/tools/perf'
Makefile:593: GTK2 not found, disables GTK2 support. Please install gtk2-devel 
or libgtk2.0-dev
...

Signed-off-by: David Ahern <dsah...@gmail.com>
Cc: Arnaldo Carvalho de Melo <a...@ghostprotocols.net>
Cc: Pekka Enberg <penb...@kernel.org>
Cc: Namhyung Kim <namhy...@kernel.org>
---
 tools/perf/Makefile |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/tools/perf/Makefile b/tools/perf/Makefile
index 1eb7f12..90cfecf 100644
--- a/tools/perf/Makefile
+++ b/tools/perf/Makefile
@@ -588,7 +588,7 @@ endif
 ifdef NO_GTK2
        BASIC_CFLAGS += -DNO_GTK2_SUPPORT
 else
-       FLAGS_GTK2=$(ALL_CFLAGS) $(ALL_LDFLAGS) $(EXTLIBS) $(shell pkg-config 
--libs --cflags gtk+-2.0)
+       FLAGS_GTK2=$(ALL_CFLAGS) $(ALL_LDFLAGS) $(EXTLIBS) $(shell pkg-config 
--libs --cflags gtk+-2.0 2>/dev/null)
        ifneq ($(call try-cc,$(SOURCE_GTK2),$(FLAGS_GTK2)),y)
                msg := $(warning GTK2 not found, disables GTK2 support. Please 
install gtk2-devel or libgtk2.0-dev);
                BASIC_CFLAGS += -DNO_GTK2_SUPPORT
@@ -596,8 +596,8 @@ else
                ifeq ($(call try-cc,$(SOURCE_GTK2_INFOBAR),$(FLAGS_GTK2)),y)
                        BASIC_CFLAGS += -DHAVE_GTK_INFO_BAR
                endif
-               BASIC_CFLAGS += $(shell pkg-config --cflags gtk+-2.0)
-               EXTLIBS += $(shell pkg-config --libs gtk+-2.0)
+               BASIC_CFLAGS += $(shell pkg-config --cflags gtk+-2.0 
2>/dev/null)
+               EXTLIBS += $(shell pkg-config --libs gtk+-2.0 2>/dev/null)
                LIB_OBJS += $(OUTPUT)ui/gtk/browser.o
                LIB_OBJS += $(OUTPUT)ui/gtk/setup.o
                LIB_OBJS += $(OUTPUT)ui/gtk/util.o
-- 
1.7.10.1

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