To open a header file, right-click the file's name in the Outline view (for example stdio.h), and then choose Open.
Many of the enhanced source navigation (including opening header files) and code development accelerators available in the C/C++ editor are extracted from the source code. To enable these features and provide the most accurate data representation, you must properly configure the project with the include paths and define directives used to compile the source.
For QNX projects, the include paths and definitions are set automatically based on the compiler and architecture. You can set additional values in the project's properties.
For C/C++ Make projects, you must define the values yourself, either manually using the Paths and Symbols tab of the project's properties, or automatically using the Set QNX Build Environment… item in the project's context menu.