Imported Upstream version 58upstream/58

1 files changed, 11 insertions, 3 deletions

diff --git a/src/cmd/cgo/doc.go b/src/cmd/cgo/doc.go
index b3aa9aded..064725c1d 100644
--- a/src/cmd/cgo/doc.go
+++ b/src/cmd/cgo/doc.go
@@ -35,9 +35,17 @@ systems.  For example:
 	// #include <png.h>
 	import "C"
 
-C identifiers or field names that are keywords in Go can be
-accessed by prefixing them with an underscore: if x points at
-a C struct with a field named "type", x._type accesses the field.
+Alternatively, CFLAGS and LDFLAGS may be obtained via the pkg-config
+tool using a '#cgo pkg-config:' directive followed by the package names.
+For example:
+
+	// #cgo pkg-config: png cairo
+	// #include <png.h>
+	import "C"
+
+Within the Go file, C identifiers or field names that are keywords in Go
+can be accessed by prefixing them with an underscore: if x points at a C
+struct with a field named "type", x._type accesses the field.
 
 The standard C numeric types are available under the names
 C.char, C.schar (signed char), C.uchar (unsigned char),