Was not able to build the broadcom-wl module without using patch linked to by cyberic. https://aur.archlinux.org/packages/broadcom-wl/

build-errors

# These are the errors I get when not using the patch:

==> Making package: broadcom-wl 5.100.82.112-12 (Mon Aug 19 15:08:35 PDT 2013)
==> Checking runtime dependencies...
==> Checking buildtime dependencies...
==> Retrieving sources...
  -> Found hybrid-portsrc_x86_64-v5_100_82_112.tar.gz
  -> Found modprobe.d
  -> Found license.patch
  -> Found user-ioctl.patch
  -> Found linux-recent.patch
==> Validating source files with sha1sums...
    hybrid-portsrc_x86_64-v5_100_82_112.tar.gz ... Passed
    modprobe.d ... Passed
    license.patch ... Passed
    user-ioctl.patch ... Passed
    linux-recent.patch ... Passed
==> Extracting sources...
  -> Extracting hybrid-portsrc_x86_64-v5_100_82_112.tar.gz with bsdtar
==> Removing existing pkg/ directory...
==> Starting build()...
patching file Makefile
patching file src/wl/sys/wl_cfg80211.c
patching file src/wl/sys/wl_iw.h
patching file src/wl/sys/wl_linux.c
(Stripping trailing CRs from patch; use --binary to disable.)
patching file src/wl/sys/wl_cfg80211.c
Hunk #1 succeeded at 1457 (offset -9 lines).
(Stripping trailing CRs from patch; use --binary to disable.)
patching file src/wl/sys/wl_linux.c
Hunk #1 succeeded at 1578 (offset -1 lines).
(Stripping trailing CRs from patch; use --binary to disable.)
patching file src/wl/sys/wl_cfg80211.c
patch unexpectedly ends in middle of line
Hunk #1 succeeded at 2073 with fuzz 1.
patching file src/wl/sys/wl_linux.c
Hunk #1 succeeded at 244 (offset 4 lines).
make: Entering directory `/usr/src/linux-3.10.7-1-ARCH'
CFG80211 API is prefered for this kernel version
Using CFG80211 API
  LD      /home/cyang/src/broadcom-wl/src/built-in.o
  CC [M]  /home/cyang/src/broadcom-wl/src/src/shared/linux_osl.o
  CC [M]  /home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.o
  CC [M]  /home/cyang/src/broadcom-wl/src/src/wl/sys/wl_iw.o
  CC [M]  /home/cyang/src/broadcom-wl/src/src/wl/sys/wl_cfg80211.o
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c: In function ‘wl_tkip_printstats’:
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:2967:7: warning: passing argument 1 of ‘wl->tkipmodops->print_stats’ from incompatible pointer type [enabled by default]
       wl->tkip_bcast_data[idx]);
       ^
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:2967:7: note: expected ‘struct seq_file *’ but argument is of type ‘char *’
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:2970:4: warning: passing argument 1 of ‘wl->tkipmodops->print_stats’ from incompatible pointer type [enabled by default]
    wl->tkipmodops->print_stats(debug_buf, wl->tkip_ucast_data);
    ^
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:2970:4: note: expected ‘struct seq_file *’ but argument is of type ‘char *’
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c: In function ‘wl_reg_proc_entry’:
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:3177:2: error: implicit declaration of function ‘create_proc_entry’ [-Werror=implicit-function-declaration]
  if ((wl->proc_entry = create_proc_entry(tmp, 0644, NULL)) == NULL) {
  ^
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:3177:22: warning: assignment makes pointer from integer without a cast [enabled by default]
  if ((wl->proc_entry = create_proc_entry(tmp, 0644, NULL)) == NULL) {
                      ^
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:3182:16: error: dereferencing pointer to incomplete type
  wl->proc_entry->read_proc = wl_proc_read;
                ^
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:3183:16: error: dereferencing pointer to incomplete type
  wl->proc_entry->write_proc = wl_proc_write;
                ^
/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.c:3184:16: error: dereferencing pointer to incomplete type
  wl->proc_entry->data = wl;
                ^
cc1: some warnings being treated as errors
make[1]: *** [/home/cyang/src/broadcom-wl/src/src/wl/sys/wl_linux.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [_module_/home/cyang/src/broadcom-wl/src] Error 2
make: Leaving directory `/usr/src/linux-3.10.7-1-ARCH'
==> ERROR: A failure occurred in build().
    Aborting...

PKGBUILD

# Contributor: Austin ( doorknob60 [at] gmail [dot] com )
# Maintainer: Gaetan Bisson <bisson@archlinux.org>

pkgname=broadcom-wl
pkgver=5.100.82.112
pkgrel=13
pkgdesc='Broadcom 802.11abgn hybrid Linux networking device driver'
url='http://www.broadcom.com/support/802.11/linux_sta.php'
arch=('i686' 'x86_64')
license=('custom')
depends=('linux')
makedepends=('linux-headers')

[[ $CARCH = x86_64 ]] && ARCH=x86_64 || ARCH=x86_32
source=("http://www.broadcom.com/docs/linux_sta/hybrid-portsrc_${ARCH}-v${pkgver//./_}.tar.gz"
        'modprobe.d'
        'license.patch'
        'user-ioctl.patch'
        'linux-recent.patch'
        'wl-linux.patch')
sha1sums=('5bd78c20324e6a4aa9f3fafdc6f0155e884d5131'
          '89bf92286ede30dd85304c6c4e42e89cfdc0f60a'
          'ea7b67982ddc0f56fd3becb9914fd4458fe7d373'
          'a41f11ffc18dbb126176259e02dd93b6ade04a10'
          '64f99cde29168e7bd8508af30702c68f907556d9'
          'ca263b0f9f29647e4de2996bddc7c85ff0617a38')
[[ $CARCH = x86_64 ]] && sha1sums[0]='5bd78c20324e6a4aa9f3fafdc6f0155e884d5131'

backup=('etc/modprobe.d/broadcom-wl.conf')
install=install

_extramodules=extramodules-3.10-ARCH
_kernver="$(cat /usr/lib/modules/${_extramodules}/version)"

build() {
	cd "${srcdir}"

	patch -p1 -i linux-recent.patch
	patch -p1 -i user-ioctl.patch
	patch -p1 -i license.patch
	patch -p1 -i wl-linux.patch

	make -C /usr/lib/modules/"${_kernver}"/build M=`pwd`
}

package() {
	cd "${srcdir}"

	install -D -m 755 wl.ko "${pkgdir}/usr/lib/modules/${_extramodules}/wl.ko"
	gzip "${pkgdir}/usr/lib/modules/${_extramodules}/wl.ko"

	install -D -m 644 lib/LICENSE.txt "${pkgdir}/usr/share/licenses/${pkgname}/LICENSE"
	install -D -m 644 modprobe.d "${pkgdir}"/etc/modprobe.d/broadcom-wl.conf
}

wl-linux.patch

diff -Naur old/src/wl/sys/wl_linux.c new/src/wl/sys/wl_linux.c
--- old/src/wl/sys/wl_linux.c	2013-08-19 15:11:36.931943013 -0700
+++ new/src/wl/sys/wl_linux.c	2013-08-19 15:17:53.126571659 -0700
@@ -2957,7 +2957,12 @@
 wl_tkip_printstats(wl_info_t *wl, bool group_key)
 {
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 14)
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
+	struct seq_file sfile;
+	struct seq_file *debug_buf = &sfile;	
+#else
 	char debug_buf[512];
+#endif
 	int idx;
 	if (wl->tkipmodops) {
 		if (group_key) {
@@ -2970,7 +2975,11 @@
 			wl->tkipmodops->print_stats(debug_buf, wl->tkip_ucast_data);
 		else
 			return;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
+		printk("%s: TKIP stats from module: %s\n", debug_buf->buf, group_key?"Bcast":"Ucast");
+#else
 		printk("%s: TKIP stats from module: %s\n", debug_buf, group_key?"Bcast":"Ucast");
+#endif
 	}
 #endif 
 }
@@ -3115,17 +3124,24 @@
 	return 0;
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
 static int
 wl_proc_read(char *buffer, char **start, off_t offset, int length, int *eof, void *data)
+#else
+static ssize_t 
+wl_proc_read (struct file *filp, char __user *buffer, size_t length, loff_t *data)
+#endif
 {
 	wl_info_t * wl = (wl_info_t *)data;
 	int bcmerror, to_user;
 	int len;
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
 	if (offset > 0) {
 		*eof = 1;
 		return 0;
 	}
+#endif
 
 	if (!length) {
 		WL_ERROR(("%s: Not enough return buf space\n", __FUNCTION__));
@@ -3138,8 +3154,13 @@
 	return len;
 }
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
 static int
 wl_proc_write(struct file *filp, const char __user *buff, unsigned long length, void *data)
+#else
+static ssize_t 
+wl_proc_write(struct file *filp, const char __user *buff, size_t length, loff_t *data)
+#endif
 {
 	wl_info_t * wl = (wl_info_t *)data;
 	int from_user = 0;
@@ -3169,18 +3190,33 @@
 	return length;
 }
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 10, 0)
+static const struct file_operations wl_fops = {
+     .owner	= THIS_MODULE,
+     .read	= wl_proc_read,
+     .write	= wl_proc_write,
+};
+#endif
+
 static int
 wl_reg_proc_entry(wl_info_t *wl)
 {
 	char tmp[32];
 	sprintf(tmp, "%s%d", HYBRID_PROC, wl->pub->unit);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
 	if ((wl->proc_entry = create_proc_entry(tmp, 0644, NULL)) == NULL) {
 		WL_ERROR(("%s: create_proc_entry %s failed\n", __FUNCTION__, tmp));
+#else
+	if ((wl->proc_entry = proc_create(tmp, 0644, NULL, &wl_fops)) == NULL) {
+		WL_ERROR(("%s: proc_create %s failed\n", __FUNCTION__, tmp));
+#endif
 		ASSERT(0);
 		return -1;
 	}
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 10, 0)
 	wl->proc_entry->read_proc = wl_proc_read;
 	wl->proc_entry->write_proc = wl_proc_write;
 	wl->proc_entry->data = wl;
+#endif
 	return 0;
 }