Added check for fork() to fix the MinGW build.

configure

diff --git a/configure b/configure
index 0cb457e..3462dac 100755
--- a/configure
+++ b/configure
@@ -16151,6 +16151,7 @@
 
 
 
+
 for ac_func in \
 	_lwp_create \
 	_lwp_self \
@@ -16165,6 +16166,7 @@
 	clone \
 	epoll_create \
 	finite \
+	fork \
 	fpclass \
 	fstatfs \
 	fstatvfs \

configure.ac

diff --git a/configure.ac b/configure.ac
index cd482da..9a12968 100644
--- a/configure.ac
+++ b/configure.ac
@@ -1074,6 +1074,7 @@
 	clone \
 	epoll_create \
 	finite \
+	fork \
 	fpclass \
 	fstatfs \
 	fstatvfs \

dlls/gdi/printdrv.c

diff --git a/dlls/gdi/printdrv.c b/dlls/gdi/printdrv.c
index 732b3f7..6c84d8f 100644
--- a/dlls/gdi/printdrv.c
+++ b/dlls/gdi/printdrv.c
@@ -481,6 +481,7 @@
             return -1;
     }
     TRACE("command: '%s'\n", psCmdP);
+#ifdef HAVE_FORK
     if (*psCmdP == '|')
     {
         int fds[2];
@@ -510,6 +511,7 @@
         TRACE("Need to execute a cmnd and pipe the output to it\n");
     }
     else
+#endif
     {
         char *buffer;
         WCHAR psCmdPW[MAX_PATH];

include/config.h.in

diff --git a/include/config.h.in b/include/config.h.in
index 8cdb8e5..0997143 100644
--- a/include/config.h.in
+++ b/include/config.h.in
@@ -92,6 +92,9 @@
 /* Define to 1 if you have the <fontconfig/fontconfig.h> header file. */
 #undef HAVE_FONTCONFIG_FONTCONFIG_H
 
+/* Define to 1 if you have the `fork' function. */
+#undef HAVE_FORK
+
 /* Define to 1 if you have the `fpclass' function. */
 #undef HAVE_FPCLASS